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RacketJetBrains MPS
Free

Free and open source, supported by donations.

 Free

Free to download, with optional paid services from JetBrains.

Windows, macOS, Linux, Command line Windows, macOS, Linux
  • Macros that let you build your own languages
  • Cross-platform GUI framework included
  • Projectional editor supports tables, diagrams and math notation
  • Editor support with quick fixes and completion for custom languages
  • Smaller ecosystem than mainstream languages
  • Lisp-style syntax takes adjustment for newcomers
  • Steep learning curve for language design
  • Specialised tool rather than a general code editor
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 OR MIT License: Apache-2.0
No account needed Not stated if an account is needed
Works offline Works offline

Checked October 1, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.