Currently only solo mining with the wallet is supported.
The algo might also be forked from SpreadDoubleKetchup to SpreadDoubleKetchupPrimeGradeABeef later on so some CPU / GPU devs might just want for that to happen before developing an external miner.

@Zettelkasten dev

Since the exchange discussion seems to happen, i'll just leave this here (that i just posted on the discord as well)

crytobridge listing fee is 1 BTC for listing, 3 BTC fast listing (but those are fake numbers anyways)
RVN got listed for free because it had enough trade volume already in the #trading channel on the discord (by the way, first ZETTEL trade on the discord happened yesterday)
PGN sucked some dicks and got the reduction to 0.5 BTC then they got some gullible people to donate PGN then they sold those PGN for BTC to some other gullible people
PGN is a premined pump and dump shitcoin AND cryptobridge were aware of the premine and refused them at first.

So you can expect something like ZETTEL that is 100% legit with a fair launch (ANN even pre announced before launch), no premine and still on the CPU phase to get over there with no issue
Who knows, just give it some time, some more people over there, why not grow the discord to 1 - 2k people with some more trades going on and you probably can get a free listing on a DEX.

I personally don't support shit exchanges like cryptopia (15 BTC listing), bittrex (dick sucking listing), binance (200k usd listing), coinexchange (4? btc listing) that are centralized bullshits, keeps your coins hostage with insane withdrawal fee that they can increase at any time, insane withdrawal / deposit time that can be hours to even few days, that are always down, registration closed, that are shady af by having some infos like your id card scan that they can resell to some 3rd party and such and don't even gives you access to your private keys.

Imo, decentralized exchanges are the future and need some more love, still pretty unpopular for now since people just want to make their coins pump and dump coins but that's where the future is heading toward and will replace those shit centralized bullshits in the coming years.

Note: Cryptobridge is currently semi-decentralized but have been pretty reliable so far, they also just updated their roadmap which is pretty nice.
And is definitely popular enough to be better than your other options combined (an other coin get often some 60 BTC daily volume over there which is... pretty darn nice)

So basically...
Right now, everyone can sell because everyone can mine even with shit CPU.
For example, back in january i was mining a RVN block per day with a single GPU, now it would take me over 4+ months to get a single RVN block with that same GPU.
Right now, i'm mining multiple ZETTLE blocks per day with shit CPUs.
Why everyone wants insta exchange to the moon instead of letting the organic growth happening which is best kind of growth ?

Sure you can do some dumps, selling some mn's and easily get on those super expensive centralized exchanges
(which, you don't sell mn because, let's be honest, we all know what those are about)

Sure you can try some never heard of brand new and "free" exchanges that can pull out a Mt. Gox on you (which, if i read you correctly, you don't mind ?)
Imo even if you think that might bring some more people in, that won't be the case.

If you want more people in, just give it some time, don't be in a hurry
Let the slow organic growth settle in, some more people mining over time and keep in mind that the miners are usually also the buyers.
Your coin already has something that RVN (https://coinmarketcap.com/currencies/ravencoin/) doesn't have. You have an ANN that was ready for launch.
(while the ANN over there was release 11 days later by a community member).
Also, the reason why i'm talking about RVN so much is because you got a small adoption wave that happened during the week from some people that are from the RVN community.
It could be a bigger adoption wave from that community if you don't mess that up, since Cryptobridge basically became RVN.

So, in short, that's just my opinion, you do whatever you want with it.

That would be a shame if you listen to those "When exchange", "Coin ded, dev not here", "When moon" people while you can just ignore them, get a proper listing for your coin in due time on a decentralized exchange
(which is where the fucking future is heading toward).
There is actually a meme out there that i particularly find very fucking accurate
https://cdn.discordapp.com/attachments/431078143038849036/431078711706648576/rvnexchange.jpg
And could be the same ZETTEL.

If your aiming for Cryptobridge as your first exchange, plenty of people that are currently mining ZETTEL are already using that exchange (since they come from the RVN community).
But don't rush things because people are fucking impatient kids that want everything instantly.
You can do the things right by being patient and get listed without having to use your community as fucking customers by dumping on them or shits like that.