All things Zcash outside of the core protocol and zcashd codebase itself. This includes third party tools (both proprietary and open source), and services (example: chain split detector website). This also includes supporting external products and services, as well as developing in-house products.
Focus: the Zcash Consensus Protocol current and future upgrades, including R&D, specification, interfacing with the ZIP process.
Clarification: The consensus protocol excludes other protocols like the p2p protocol, the RPC protocol, light wallet protocols, etc… except where those obviously interact with consensus considerations.