IOV Weave
Easy-to-use SDK to build Tendermint ABCI applications
... state machines. More directly, it is based on the official cosmos-sdk, both the 0.8 release as well as the future 0.9 rewrite. Naturally, as I was the main author of 0.8. While both of those are extremely powerful and flexible and contain advanced features, they have a steep learning curve for novice users. Thus, this library aims to favor simplicity over power when there is a choice.