racket

Interactive, integrated, graphical Scheme programming environment

Racket is a set of tools for writing and running the PLT scheme programming language. It includes a graphical IDE (drracket) that features highlighting of the source of syntax and run-time errors, support for multiple language levels, an algebraic stepper, objects, modules, a GUI library, TCP/IP, and much more. It includes an extensive, hyper-linked help system called Help Desk, available from the Help menu, the plt-help command line tool, or through a web browser.