- `app` provides an application for users, rather than a library

- `concurrency` provides something useful for concurrent programming
- `config` something related to configuration, such as reading from env vars or flags
- `crypto` something related to cryptography, including hash algorithms and TLS bindings

- `data` provides a data structure of some sort
- `datetime` something related to dates or times
- `debug` something related to debugging programs
- `deprecated` something considered old and no longer supported
- `docs` provides documentation of something, useful for "-docs" complement packages
- `documenting` provides something useful for documenting code

- `editors` something related to IDEs and code editors, such as DrRacket plugins
- `experimental` not yet ready for use by those who don't want to worry about their dependencies breaking their APIs

- `ffi` provides something useful for Foreign Function Interfaces (for calling code in binaries outside the Racket binary)
- `functional` provides something related to functional programming, typically a combinator library or some other Haskell-ish concept

- `game` provides a game or other interactive entertainment app
- `gamedev` provides something useful for game development, such as a game state engine or 3d graphics
- `graphics` provides something related to drawing, images, or GUIs

- `io` provides something related to reading and writing data

- `lang` provides a #lang language
- `learning` provides resources for learning, such as a tutorial, book, or example use of something
- `logic` something related to logic programming, such as a constraint solver

- `match` something related to pattern matching (typically extensions to the built in pattern matching library)

- `network` provides something useful for making network calls and implementing various protocols

- `parsing` provides something related to parsing unstructured data into structured data
- `performance` something related to performance, including benchmarking or ultra-fast-but-unsafe data structures
- `personal` provides something meant for a specific person, such as a grab bag of personal utilities

- `raco` provides a raco command
- `reader` provides something that modifies the racket reader, such as adding reader syntax for shorter anonymous functions
- `repl` something related to REPLs

- `service` something related to calling out to an external service, such as a Github client API
- `storage` provides something useful for persistent storage of values, such as database clients
- `sugar` provides a simple shortcut that's generally useful and not specific to a particular library
- `syntax` provides something useful for macros and other syntax object manipulations

- `testing` provides something useful for testing code
- `tests` provides tests of something, similar to `docs` tag
- `text` provides something related to strings and/or text
- `types` something related to types or type systems

- `web` something related to "Web" technology, such as html/xml parsing, CSS engines, racket-to-javascript compilers, REST frameworks, etc.