It was a low-hanging-fruit, on my list for a long time. It was prompted by the fact that I will present Zappool next week at Freedom Tech Summit @FreedomTechSummit 😎
For Zappool, I have an idea for a hybrid mode: set an arbitrary percentage, and some work goes to pooled mining, some to solo. So there's a probability for you to hit the jackpot (full block reward, but lower chance), but also get some small instant rewards.
Parasite Pool splits the block reward: 1 btc goes to the one who found it, the rest is distributed as a pool. It's nice that the 1 btc goes non-custodially directly to the lucky user (in the coinbase).