These are improvements to the Racket source. Fork the GitHub repository and then submit a pull request. For detailed guidance see Tutorial: Contributing to Racket.

• Find uses of alists and replace them with hash tables where appropriate (note that short alists, below ~40 items, can be faster than hashes)
  • Search for uses of assq and friends to find
• Find things that use lists for sets, replace them with racket/set
  • Search for uses of member and friends to find
• Find uses of srfi/1, replace them with racket/list stuff
• Fix Swindle to have call-next-method available without #lang swindle
• Find uses of log-xxx (using the global logger), and use 5.3.2's new define-logger form to change them to use their own logger. That way, users can filter the log messages. Examples might include "optimizer" and "file dependency" categories of messages.
• Fix warnings in C code (Forked to pmatos/racket to sort this one out. Will issue pull request when completed.)
  • Refer to the nightly build logs for our distributed platforms

• Integration Projects These are improvements to other systems to better support Racket.
• Documentation Improvements has ideas where you can help improve the documentation
• Ways to contribute to Racket

• Add support for macro-debugger/analysis/check-requires to xrepl (Completed by Eli)
• Port code that uses class100 to the current class system (Completed by Asumu)
• Get rid of units in the net collect (Done by Jon Zeppieri)