Magi is an interesting choice for CPU mining.
Gapcoin has a GPU miner now, although you can still find a reasonable amount of gapcoin CPU mining in the pool. You might also see a decent return on your mining when Gapcoin finds a new world record prime gap.
Slimcoin has a very experimental GPU miner available, however the Slimcoin dcrypt algo was designed to be CPU only. You might be able to find a couple of blocks solo mining in the wallet. Slimcoin is a very interesting and underrated alt. coin imho.
I'm CPU mining Gapcoin at present -
https://gapcoin.club