Indy Client provides a command-line tool and underlying interfaces to interact with a self-sovereign identity ecosystem on top of distributed ledger technology. This codebase will eventually be subsumed by (Indy SDK)[https://github.com/hyperledger/indy-sdk); if you are looking to build a client or agent, we recommend that you use the SDK instead, because the encapsulation and documentation here are not as clean.
Indy Node is more "core" to Indy; if you want to understand how Indy works, starting there may be better.
All bugs, backlog, and stories for Indy (except the SDK) are managed in Hyperledger's Jira; use project name INDY.
Developers may want to explore Sovrin's Getting Started Guide to learn about how Indy works. (Sovrin is the public, open ecosystem built on top of Indy technology; for more info, see [https://sovrin.org].)
Have a look at Setup Instructions to understand how to work with the code. Note that setup instructions are still changing hour-by-hour as we identify install preconditions.