Not an index of everything — a shortlist of what's actually worth reaching for, organized by what you're trying to do.
Web Frameworks
HTTP routers and frameworks for building APIs and web apps.
4 resources
CLI Tooling
Libraries for building command-line interfaces: flags, subcommands, config.
3 resources
Testing
Assertions, mocking, and test tooling beyond the standard library.
3 resources
Observability
Structured logging, metrics, and tracing.
3 resources
Database & ORM
SQL codegen, query builders, and drivers.
4 resources
Developer Tooling
Linters, live-reload, dependency injection, and debuggers.
4 resources