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About

UseTheSource is the organization that hosts and sustains the open-source community around theRascal metaprogramming language. This includes:

Core technology (runtime system, interpreter, type-checker, compiler, maven plugin)
IDE technology (Eclipse, VScode, Language Server protocol)
- plugins and extensions for Rascal itself
- plugins and extensions generated from Rascal-defined DSL specifications
Reusable libraries:
- code-as-data enablers: C/C++, Java, PHP, Python, JS, ...
- general tools: ambiguity diagnostics, UI frameworks, search, type-checking, ...

Find out more about the community's standards and valueshere

Repositories (selected)

rascal - interpreter, static checker, compiler and runtime system, standard library, tutor compiler
rascal-language-servers - VScode extension and LSP server for Rascal, including VScode extension generator and LSP server generator for DSLs
typepal - generic type and name analysis framework
rascal-maven-plugin
vallang - Algebraic terms, Relational algebra and Numbers, the value implementations and exchange format under Rascal
salix-core - Elm-style UI framework for Rascal
flybytes - Reverse and forward engineering framework for JVM bytecode.
capsule - hash-trie based fast immutable multi-sets and multi-maps that implement vallang

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rascalrascalPublic
The implementation of the Rascal meta-programming language (including interpreter, type checker, parser generator, compiler and JVM based run-time system)
Java 426 78
rascal-language-serversrascal-language-serversPublic
An LSP server for Rascal which includes an easy-to-use LSP generator for languages implemented in Rascal, and an interactive terminal REPL.
Java 18 9
rascal-corerascal-corePublic archive
Static checker, compiler to Java and run-time classes for compiled Rascal programs
Rascal 12 4
clairclairPublic
C Language Analysis in Rascal
Java 26 13

Showing 10 of 31 repositories

rascal Public
The implementation of the Rascal meta-programming language (including interpreter, type checker, parser generator, compiler and JVM based run-time system)
usethesource/rascal’s past year of commit activity
Java 426 78 472 20 UpdatedJul 4, 2025
rascal-tutor-screenshot Public
A plugin for the Rascal tutor compiler that takes screenshots of webbrowser contents for inclusion in the target documentation
usethesource/rascal-tutor-screenshot’s past year of commit activity
Java0BSD-2-Clause0 0 0 UpdatedJul 3, 2025
rascal-language-servers Public
An LSP server for Rascal which includes an easy-to-use LSP generator for languages implemented in Rascal, and an interactive terminal REPL.
usethesource/rascal-language-servers’s past year of commit activity
Java 18BSD-2-Clause 9 100 (2 issues need help) 8 UpdatedJul 3, 2025
vallang Public
Generic immutable recursive data representation API targeted at source code models and more.
usethesource/vallang’s past year of commit activity
Java 36 13 5 4 UpdatedJul 2, 2025
rascal-website Public
The rascal website hosts the Rascal project, all of its documentation, the news and the presentation of (third-party) libraries and projects written in Rascal.
usethesource/rascal-website’s past year of commit activity
Rascal 1 11 6 6 UpdatedJun 28, 2025
rascal-core-big-tests Public
A repository to automate some large scale testing of rascal-core
usethesource/rascal-core-big-tests’s past year of commit activity
Rascal0 1 0 0 UpdatedJun 27, 2025
typepal Public
TypePal is a framework for name analysis, type checking and type inference
usethesource/typepal’s past year of commit activity
Rascal 5BSD-2-Clause 4 4 1 UpdatedJun 20, 2025
rascal-maven-plugin Public
The Maven plugin for Rascal checking, compilation, testing, code generation applications integration and documentation generation.
usethesource/rascal-maven-plugin’s past year of commit activity
Java 2BSD-2-Clause 3 6 0 UpdatedJun 19, 2025
.github Public
usethesource/.github’s past year of commit activity
00 0 0 UpdatedJun 18, 2025
flybytes Public
Flybytes is an intermediate language between JVM bytecode and software languages (DSLs, PLs), for compilation and decompilation.
usethesource/flybytes’s past year of commit activity
Java 18BSD-2-Clause 6 9 0 UpdatedJun 12, 2025