Several people have been making an effort recently to get some of the altcoin wallets compiled for Mac OS X. Posts about them have been pretty scattered, so I'm starting this thread as a master list of Mac altcoin wallets, as well as a single place to discuss them.

This thread is meant for end users. We have a good Mac wallet development thread going here: https://bitcointalk.org/index.php?topic=205017.0

Here are the Mac altcoin wallets I know of. Let me know if I missed any. I'll update this list when I find or build more wallets.

DISCLAIMER: I can only vouch for the quality/security of the wallets I've built myself. Be careful and run virus/malware scans on any software you download. There's a good freeware virus scanner for Mac OS X at http://www.clamxav.com/.

Built by maxpower: (Note that my wallets may not work on versions of OS X prior to 10.7 Lion)
AeroCoin: https://www.dropbox.com/s/rhekt71bfw59fa0/AeroCoin-Qt-2.0.0.0-Mac.zip
AndroidTokens: https://www.dropbox.com/s/j371vq8axs8l0n4/androidstoken-qt-1.0.0.0-Mac.zip
Applecoin: https://www.dropbox.com/s/nd8dblpcyt8e4uv/Applecoin-Qt-1.3.0.0-Mac.zip
AsicCoins: https://www.dropbox.com/s/0qarygd6p0fjoqn/asiccoin-Qt-1.0.0.0-Mac.zip
Argentum: https://www.dropbox.com/s/e0uon8xt2xtcohu/Argentum-Qt-1.0.3-Mac.zip
Battlecoin: https://www.dropbox.com/s/janwnxcpwuqooec/Battlecoin-Qt-0.2.2.1-Mac.zip
Betacoin: https://www.dropbox.com/s/omp0y9r61vrorbh/Betacoin-Qt-0.8.99.14-1-Mac.zip
Billioncoin: https://www.dropbox.com/s/j3b0l0ogv3wzl6a/billioncoin-qt-1.1.1-Mac.zip
BitBar: https://www.dropbox.com/s/2nwsdmes08sgmzf/BitBar-Qt-0.4.0-Mac.zip
BitGem: https://www.dropbox.com/s/jrht344eewbau7f/BitGem-Qt-0.4.1.6-Mac.zip
Bitnote: https://www.dropbox.com/s/3dpa2rjpcg3igou/Bitnote-Qt-1.2.0.0-Mac.zip
BottleCaps: https://www.dropbox.com/s/97nuk9didp54wr8/BottleCaps-Qt-1.5.0.0-Mac.zip
Bytecoin: https://www.dropbox.com/s/2ug7chnqmg8vyxb/Bytecoin-Qt-0.8.1-7-Mac.zip
Cashcoin: https://www.dropbox.com/s/xmu2ave4tv14kh3/CASH-Qt-1.1-Mac.zip
ColossusCoin: https://www.dropbox.com/s/2bx48moqowdj67c/ColossusCoin-1.5.2.0-Mac.zip
CryptogenicBullion: https://www.dropbox.com/s/588ycw583z3bq3d/CryptogenicBullion-Qt-1.1.6.7-Mac.zip
DarkToken: https://www.dropbox.com/s/hvi5mef1a6fiixe/darktoken-Qt-1.0.0.0-Mac.zip?dl=0
Digitalcoin: https://www.dropbox.com/s/gjtw08tyicpp9wp/DigitalCoin-Qt-2.0.0.0-Mac.zip
Dogecoin: https://www.dropbox.com/s/1rsceoxv54svtj2/dogecoin-qt-0.6.4.0-Mac.zip
Donationcoin: https://www.dropbox.com/s/5zpdeoh9uzyikeb/Donationcoin-Qt-1.3.0.0-Mac.zip
Doubloons: https://www.dropbox.com/s/l6l8sne9kqi9pwv/Doubloons-0.6.3.0-Mac.zip
ekrona: https://www.dropbox.com/s/5lb8z41uaabtnvw/ekrona-qt-1.2.0.0-Mac.zip
eMark: https://www.dropbox.com/s/jdpcr3gvnwrlh2w/eMark-Qt-1.0.0.0-Mac.zip
Emerald: https://www.dropbox.com/s/llzh0ybxeo2czjh/Emerald-Qt-0.6.3.0-Mac.zip
FireFlyCoin: https://www.dropbox.com/s/sf4dmtun5thc0fd/FireFlyCoin-Qt-0.9.1.0-Mac.zip
Florincoin: https://www.dropbox.com/s/uf45chn9ojytjmv/Florincoin-Qt-0.6.5.14-Mac.zip
Freecoin: https://www.dropbox.com/s/gfwdxoigz1r8i8s/freecoin-Qt-1.0.0.0-Mac.zip
FuelCoin: https://www.dropbox.com/s/fsiqfl2cjj620u2/FuelCoin-Qt-0.8.8.0-Mac.zip
GameCoin: https://www.dropbox.com/s/tgh1lgqwz24wdkf/Gamecoin-Qt-0.8.4.2-Mac.zip
GLDCoin: https://www.dropbox.com/s/vphq2crmkcfbi41/GLDCoin-Qt-0.6.9.3-Mac.zip
Globe: https://www.dropbox.com/s/tmk4xq0uxt535jk/Globe-Qt-0.4-Mac.zip
Gold Pressed Latinum: https://www.dropbox.com/s/ydy3le47bxp8p9i/GoldPressedLatinum-Qt-2.5.0.0-Mac.zip
Grandcoin: https://www.dropbox.com/s/ka2eqheool33ft7/Grandcoin-Qt-0.6.3.0-Mac.zip
HoboNickels: https://www.dropbox.com/s/b4ftnmc95kx3pnq/HoboNickels-Qt-1.3.0.0-Mac.zip
Huntercoin: https://www.dropbox.com/s/u686xtp92uzfon3/HunterCoin-Qt-1.0.11-Mac.zip
HyperCoin: https://www.dropbox.com/s/55n9rvbyqo7un2x/hypercoin-qt-1.0.0.0-Mac.zip
Infinitecoin: https://www.dropbox.com/s/doqwnrvhnrtgt2g/Infinitecoin-Qt-0.6.3.0-Mac.zip
iXcoin: https://www.dropbox.com/s/jzabc3mm8hxhxex/iXcoin-Qt-0.8.6.0-Mac.zip (new QT client, back up your old wallet before using)
Joulecoin: https://www.dropbox.com/s/uqfrzmlwqti3xfo/Joulecoin-Qt-0.8.99.9-Mac.zip
Krugercoin: https://www.dropbox.com/s/56635aw8n17a05l/KrugerCoin-Qt-0.7.0.5-Mac.zip
Lightspeed: https://www.dropbox.com/s/ugbqcgwadsma06s/lightspeed-Qt-1.0.0.0-Mac.zip?dl=0
Luckycoin: https://www.dropbox.com/s/yz1xsnevbgf90p0/Luckycoin-Qt-1.0.0.0-Mac.zip
MediterraneanCoin: https://www.dropbox.com/s/o3i9pk6nmajbx6m/Mediterraneancoin-Qt-0.8.7.2-Mac.zip
Megacoin: https://www.dropbox.com/s/z5qf4c0wm2n3sza/Megacoin-Qt-0.8.996E-Mac.zip
MemoryCoin: https://www.dropbox.com/s/8pw065n25hm1v2h/MemoryCoin-Qt-0.8.5-66-Mac.zip
Molecule: https://www.dropbox.com/s/jrlyd0m51m9rjq0/Molecule-Qt-0.8.10.2-Mac.zip
Mooncoin: https://www.dropbox.com/s/ripfzgpbh6buwkc/Mooncoin-Qt-1.862.1-Mac.zip
Mintcoin: https://www.dropbox.com/s/sll88c9jvh6gwfd/mintcoin-qt-1.11.0.0-Mac.zip
Namecoin: https://www.dropbox.com/s/76xkqillvxf5blb/Namecoin-Qt-0.3.75-Mac.zip (from new Namecoin development at https://github.com/namecoin/namecoin, work still in progress, back up your wallet!)
Nibble: https://www.dropbox.com/s/0eptl596hxnjpl0/nibble-qt-0.6.5.2-Mac.zip
Orangecoin: https://www.dropbox.com/s/ebqf0hmb5iw6rcl/orangecoin-qt-1.0.4.0-Mac.zip
Particle: https://www.dropbox.com/s/n7icslbcjrdx0t5/Particle-Qt-0.8.6.2-Mac.zip
PhenixCoin: https://www.dropbox.com/s/dhhy4nc1tshqtaw/phenixcoin-Qt-0.6.4.9-Mac.zip
PiggyCoin (old scrypt version): https://www.dropbox.com/s/r8wpr3hmy8sxz4c/PiggyBank-1.4-Mac.zip
PiggyCoin (new X11 version): https://www.dropbox.com/s/ro35qa0jnp49noo/newpiggycoin-Qt-1.0.0.0-Mac.zip
PopularCoin: https://www.dropbox.com/s/4kcsnhtl4ll4oa9/PopularCoin-Qt-0.8.7.0-Mac.zip
Powercoin: https://www.dropbox.com/s/4jl5xi543vrzf90/Powercoin-Qt-0.6.3.0-Mac.zip
Quark: https://www.dropbox.com/s/i17lj5ag3jg9vi4/Quarkcoin-Qt-0.8.3.24-Mac.zip
QQcoin: https://www.dropbox.com/s/gcvjj23lbodx10v/QQcoin-Qt-1.0.2.0-Mac.zip
Radioactivecoin: https://www.dropbox.com/s/0qzb4qzpwa0sp3j/Radioactivecoin-Qt-1.3.2.0-Mac.zip
Securecoin: https://www.dropbox.com/s/eff5cxp3zbxgoep/Securecoin-Qt-1.0-Mac.zip
Skeincoin: https://www.dropbox.com/s/g85kkxbcnkugrlp/Skeincoin-Qt-0.8.99.3-Mac.zip
SlimCoin: https://www.dropbox.com/s/b5irhas4xqvh2pb/Slimcoin-Qt-0.3.0.0-Mac.zip
Sterlingcoin: https://www.dropbox.com/s/314ocnwecfq28q4/Sterlingcoin-Qt-1.0.0.0-Mac-3.zip?dl=0
Tagcoin: https://www.dropbox.com/s/gyyra84qm9zcdmu/TagCoin-Qt-1.0.5-Mac.zip
Takeicoin: https://www.dropbox.com/s/dgx9789mgb3xgx1/TakeiCoin-Qt-0.9.1.3-Mac.zip
TEK: https://www.dropbox.com/s/y17rjlji1ruxgsv/tekcoin-Qt-2.0.1.0-Mac.zip?dl=0
Terracoin: https://www.dropbox.com/s/yrsjhhn7syqhgn9/Terracoin-Qt-0.8.0.4-Mac.zip
Teslacoin: https://www.dropbox.com/s/4eczr5l5dqcmf0o/Teslacoin-Qt-3.0.0.0-Mac.zip
Thanks: https://www.dropbox.com/s/u9p3z7mpo235u07/Thanks-Qt-1.1-Mac.zip
Tigercoin: https://www.dropbox.com/s/43xecukdd6k1a3q/Tigercoin-Qt-1.1.0.0-Mac.zip
Trollcoin: https://www.dropbox.com/s/n4x3k24fbxcvuzj/TrollCoin-Qt-1.2.0.0-Mac.zip
Truckcoin: https://www.dropbox.com/s/um63xcwpcpremau/truckcoin-qt-0.9.5.0-Mac.zip?dl=0
Ultracoin: https://www.dropbox.com/s/egoan01alppkqe5/UltraCoin-Qt-1.0.4.1-Mac.zip
UniCoin: https://www.dropbox.com/s/xbdm462cjv2tr5z/UniCoin-Qt-1.0.0.0-Mac.zip
UniversalMolecule: https://www.dropbox.com/s/fqdwqvp1mzpyyr8/UniversalMolecule-Qt-0.8.12.1-Mac.zip
Unobtanium: https://www.dropbox.com/s/iksn2zsnt7jakas/Unobtanium-Qt-0.9.2.9-Mac.zip
USCoin: https://www.dropbox.com/s/vjwhgy99mlfp61k/USCoin-Qt-0.6.3.0-Mac.zip
Velocitycoin: https://www.dropbox.com/s/m1ojdha30xumjm6/Velocitycoin-Qt-1.1.2.0-Mac.zip
Whitecoin: https://www.dropbox.com/s/v5f5au4psjkljsx/whitecoin-qt-1.0.1-Mac.zip
Worldcoin: https://www.dropbox.com/s/6ahqz35jgiicji6/Worldcoin-Qt-0.8.6.2-1-Mac.zip
W2Coin: https://www.dropbox.com/s/zn2hismdxh7qfwk/W2Coin-Qt-1.0.0.0-Mac.zip
YaCoin: https://www.dropbox.com/s/xqvc8nzyndt25d4/yacoin-qt-0.4.3-Mac.zip
Zetacoin: https://www.dropbox.com/s/9opm1muc3bq3ve5/Zetacoin-Qt-0.8.99.13.zip

Built by jrlepage:
HyperCoin: https://dl.dropboxusercontent.com/u/7405118/hypercoin-qt.zip
Mincoin: https://dl.dropboxusercontent.com/u/7405118/MinCoin-Qt_v064.zip

Built by bushstar:
Feathercoin: http://www.feathercoin.com/dl/feathercoin-mac.zip
FRANKO: http://frankos.org/downloads/Franko-0.8.5.1-Mac.zip

Built by twobits:
Devcoin: https://www.box.com/s/ntna8dibxek351s42fxu
Ixcoin: GUI: https://www.box.com/s/d4g2d4lq2jez7jcwj8na | Daemon: https://www.box.com/s/a1y9kcalxxksnxkldysa
Namecoin: GUI: https://www.box.com/s/tf8v3kzrdcawn5yfc1om | Daemon: https://www.box.com/s/ouqsqb5xcw88g0qmaljl
Noirbits: https://app.box.com/s/gjlaldl0u9ft9mjap3qw

Built by coblee:
Litecoin: https://litecoin.org/

Built by Kosmatik:
OneCoin: https://docs.google.com/file/d/0B58-u3zKUlLdSkVGekxBbEZHSW8/edit?usp=sharing

Built by shitscared:
Fastcoin: http://www.fastcoin.ca/downloads.html
GIL: https://www.dropbox.com/s/n04pmfmxb7todck/Gilcoin-Qt.dmg.zip
Alphacoin: https://www.dropbox.com/s/sapifb1iwja2ceu/Alphacoin-Qt.dmg.zip

Built by bitpar:
BBQcoin: http://www.sendspace.com/file/t3nhtz

Built by cobrabyte:
StableCoin: https://bitcointalk.org/index.php?topic=349198.msg4230247#msg4230247

Built by Bale80:
Netcoin: http://forum.netcoinfoundation.org/Netcoin-Qt.dmg
NoodlyAppendageCoin: http://noodlyappendagecoin.com/downloads/noodlyappendagecoin-qt.dmg

Built by JahPowerBit:
XCP: https://github.com/JahPowerBit/counterpartyws/raw/master/dist/counterpartyws.app.zip

Built by pcmerc:
CasinoCoin: http://pcmerc.com/files/CasinoCoin-Qt.dmg
Dopecoin: http://pcmerc.com/files/Dopecoin-Qt.dmg
ECCoin: http://pcmerc.com/files/ECCoin-Qt.dmg
FairCoin: http://pcmerc.com/files/FairCoin-Qt.dmg
GPUCoin: http://pcmerc.com/files/GPUCoin-Qt.dmg
GrumpyCoin: http://pcmerc.com/files/GrumpyCoin-Qt.dmg
KaChingCoin: http://pcmerc.com/files/KaChingCoin-Qt.dmg
LottoCoin: http://pcmerc.com/files/LottoCoin-Qt.dmg
Orobit: http://pcmerc.com/files/Orobit-Qt.dmg
Rubycoin: http://pcmerc.com/files/Rubycoin-Qt.dmg
StarCoin: http://pcmerc.com/files/StarCoin-Qt.dmg
SUNcoin: http://pcmerc.com/files/SUNcoin-Qt.dmg
ThePandacoin: http://pcmerc.com/files/ThePandacoin-Qt.dmg
ZeitCoin: http://pcmerc.com/files/ZeitCoin-Qt.dmg
SiliconValleyCoin: http://pcmerc.com/files/Silicon_Valley-Qt.dmg
GOODCoin: http://pcmerc.com/files/GOODCoin-Qt.dmg

Built by Kergekoin:
Mintcoin: https://www.dropbox.com/s/yz1uqioci1qsn2h/MintCoin-1.6-macosx.dmg

Built by MystPhysX:
FedoraCoin (TiPS): http://chainexplorer.info/files/FedoraCoin-Qt%201.0.dmg
LiteBar: http://chainexplorer.info/files/LiteBar-Qt.dmg
CannaCoin: https://dl.dropboxusercontent.com/u/60507461/Cannacoin-Qt.zip
Blakecoin: http://chainexplorer.info/files/BlakeCoin.dmg
SocialCoin: http://chainexplorer.info/files/SocialCoin.dmg
TheBotCoin: http://chainexplorer.info/files/TheBotCoin-Qt.dmg
SambaCoin: http://chainexplorer.info/files/SambaCoin-Qt.dmg
FairCoin: http://chainexplorer.info/files/FairCoin-Qt.dmg
SourceCoin: http://chainexplorer.info/files/SourceCoin-Qt.dmg
Colossus Coin: https://dl.dropboxusercontent.com/u/60507461/ColossusCoin.zip
CinniCoin: https://dl.dropboxusercontent.com/u/60507461/CinniCoin-Qt.zip
FlutterCoin: https://dl.dropboxusercontent.com/u/60507461/FlutterCoin-Qt.zip
BTCTalkCoin: https://dl.dropboxusercontent.com/u/60507461/BTCtalkcoin-Qt.zip
Colossus Coin: https://dl.dropboxusercontent.com/u/60507461/ColossusCoin.zip
Shibecoin: https://dl.dropboxusercontent.com/u/60507461/shibecoin-qt%200.7.7.zip
Sourcecoin: https://dl.dropboxusercontent.com/u/60507461/SourceCoin-Qt.zip
Sync: https://dl.dropboxusercontent.com/u/60507461/Sync-Qt.zip
XtraCoin: https://dl.dropboxusercontent.com/u/60507461/xtracoin-Qt2.zip
PawnCoin: https://dl.dropboxusercontent.com/u/60507461/pawncoin-qt.zip
FlutterCoin: https://dl.dropboxusercontent.com/u/60507461/FlutterCoin-Qt.zip
BwinCoin: https://dl.dropboxusercontent.com/u/60507461/BwinCoin-Qt.zip
ActiveCoin: https://dl.dropboxusercontent.com/u/60507461/ActiveCoin-qt.zip
GROUPCoin: https://dl.dropboxusercontent.com/u/60507461/GROUPCoin-Qt.zip
MillionaireCoin: https://dl.dropboxusercontent.com/u/60507461/MillionaireCoin-Qt.zip
XCloudCoin: https://dl.dropboxusercontent.com/u/60507461/XCloudcoin-Qt.zip
PURE: https://dl.dropboxusercontent.com/u/60507461/PureCoin-Qt.zip
Socialxbot: https://dl.dropboxusercontent.com/u/60507461/SOCIALBOT-Qt.zip
Solarcoin: https://dl.dropboxusercontent.com/u/60507461/SolarCoin-Qt.zip
Equinox: https://www.dropbox.com/s/mjc2nsyyxbonjge/EquinoxCoin-Qt.zip?dl=0
Solcoin: https://www.dropbox.com/s/z93z3qmhgnzhvtb/Solcoin-Qt.zip?dl=0

Built by schernikau:
BlakeBitcoin: https://mega.co.nz/#!MEkHhaoB!F9UFRKRTeo3EuuiT71ck8_NhSxJSRffi6sOY2owvM0g
BitcoinPlus (XBC): https://mega.co.nz/#!dN8mnLKY!zb0hUN5Wl6F9UAmj2JKxMN7dtEIPdQB1h-liH71rMjA
Electron: https://mega.co.nz/#!gR8mHDxZ!Qn76XottB5oaE3IC9fZaUgbtNWRYqfmiyMRZhXd1dVk
Photon: https://mega.co.nz/#!gBVSmJRQ!-3epMmez1fkn-UaXRx8F4-q6IYr44hiQLxzhAGeMe5Q

Built by jyap, for OS X 10.7+:
Continuumcoin: https://www.dropbox.com/s/hxdql6nwvov68ti/ContinuumCoin-Qt.0.9.0.3.dmg
Dirac: https://www.dropbox.com/s/3s8cafmkqd1v0rf/Dirac-Qt-macports_10.8.dmg
Nautiluscoin: https://www.dropbox.com/s/m8hdnyefbbucxw4/Nautiluscoin-Qt-macports_10.8.dmg
OpenSourcecoin: https://www.dropbox.com/s/niys6hysfeajwqb/Ocoin-Qt-macports_10.8.dmg
Zimstake: https://mega.co.nz/#!ZEpEVBqC!dclNx5q-7JB4hZ_nmbYAtN14Z5-xOJ44Mbkc7elopa8
Nautiluscoin: https://s3.amazonaws.com/nautiluscoin/Nautiluscoin-Qt-signed.dmg (latest)
Pinkcoin: http://crypto.pink/wallet/pinkcoin-Qt-1.0.1.1-signed.dmg
Razorcoin: http://razorco.in/Razor-Qt-signed.dmg
Unobtanium: http://www.mediafire.com/download/d9cbycnnxie5n3a/Unobtanium-Qt-0.9.5.dmg

Built by marine4u:
Marinecoin: http://download.marinecoin.org/download/Marinecoin-qt.zip

Built by crypto_zoidberg:
Boolberry: http://boolberry.com/downloads.html#Mac

Built by unknown builder(s):
AnonCoin: https://anoncoin.net/Downloads.html
DarkCoin: https://www.dropbox.com/s/wtadyzztgrs0ihw/Xcoin-Qt.app.osx10.7.zip
Elacoin: https://github.com/elacoin/elacoin/tree/master/mac-binaries
KittehCoin: https://kittehcoin.info/
Noirbits: https://mega.co.nz/#!v84CDSCY!ZMrvWhmEP4ahVKsRH9dBxEc4G8w76-KbwyB0UEsVyUU
Novacoin: http://sourceforge.net/projects/novacoin/files/
Spots: https://app.box.com/s/gw7hpy7xug18wr3rmo9d
PPCoin: https://mega.co.nz/#!gQwxGTJC!B6D6f1RWbFRBTp-4U0KYYAmAfzEz-myKVzyIPEppHfk
AppleByte: http://AppleByte.me
MemoryCoin: http://shrine.mmc-square.com/Memorycoin-QT(Mavericks).dmg
BitShares-PTS: https://github.com/BitShares/BitShares-PTS/releases
Digit: http://digitpayment.org/digit_downloads/Digit-MacOSx.dmg
HyperStake: https://github.com/presstab/HyperStake/releases/download/v1.0.6/HyperStake-qt-106-OSX.zip