Based on 3 projects in the stack in this category, 2 with 100+ stars and 3 active in the last year.
Gaps we see
Only 2 project(s) here have 100+ stars. There's room for a reference-quality open-source project.
No project in this category ships its own on-chain program (Anchor, Pinocchio or native) that we detected. Most are clients or off-chain services, so an open, audited program is a clear gap.