Cognitox – open-source Amazon Cognito emulator written in Rust
Local Cognito emulator with admin UI beats LocalStack for focused authentication testing.
SGI Indy Emulator
Vibe-coded SGI Indy emulator in Rust that actually boots IRIX 6.5 with X11.
Retro computing enthusiasts, Rust developers, and MIPS architecture historians.
MAME · QEMU · xemu
Local Cognito emulator with admin UI beats LocalStack for focused authentication testing.
Rust book ending with a Redis clone instead of the usual todo apps.
This actually implements a surprisingly large slice of Snowflake: VARIANT/ARRAY/OBJECT types, LATERAL FLATTEN, QUALIFY, MERGE, COPY, transactions and ~90 JSON/array/window functions — all exposed via Snowflake SQL API v2 and compatible with the Go driver so most clients can point at localhost. Running on DataFusion in Rust and shipped as a Docker image with testcontainers/GHA examples makes it immediately useful in CI; just remember it's an emulator, not Snowflake's full runtime, so you may hit edge-case behavioral differences.
Most Rust books stop at ownership; this builds a working Redis clone.
Infinite canvas terminal with minimap—tmux tabs but actually visible.
4.4x faster parsing than xterm.js with 73KB bundle and zero dependencies.