This is an (incomplete) list of altcoins that have implemented Segwit and are implementing off-chain payment solutions like the Lightning Network that need a malleability fix to work.
Lightning Network (mainnet testing)-
Groestlcoin (Eclair)
-
Syscoin (Eclair)
-
Bitcoin (c-lightning, Eclair)
Segwit activated:-
Groestlcoin (info
here, first coin with Segwit, locked in & activated end of January 2017)
-
Syscoin (activated as a hard fork on March 31)
-
Bitcore (adopted from the start, still very small)
-
Digibyte (
activated)
-
Monacoin (
activated)
-
Litecoin (
activated)
-
VertCoin (
activated)
-
NAVcoin - (probably) first Proof of Stake coin with Segwit
-
Viacoin (activated in July?)
-
Bitcoin (finally activated on August 24, 2017)
-
Creativecoin (Dec. 2017)
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Myriadcoin (Jan. 2018)
-
GramCoin (
March 2018)
- BSD Bitsend ?
In adoption phase (signalling):- Bitmark? (BTM)
Planned- MAC Machinecoin (coding Done)
- Woodcoin (segwit-supporting client available)
- Belacoin (
planned)
-
iXcoin (no exact info found) ?
-
i0coin (planned, "next update")
-
Stratis (no exact info found) ?
Update January 2018: If you want a coin to get added, please provide me:
- the name of the coin, obviously
- the currently active Bitcointalk thread
- the date (month is ok) when Segwit was activated or has been "locked in"; if it has been locked in provide me the approximate activation date.
I won't add more coins to the "Planned" nor "Signalling" sections and add only coins where it is already activated or locked in.