Clear Rexx syntax
Express intent directly, with the approachable syntax that made Rexx enduring.
Modern Rexx, built for today
A familiar language.
A modern toolchain.
CREXX brings Rexx clarity to native applications, scripting and systems programming—across macOS, Linux and Windows.
Open source · Native compilation · Portable runtime
options levelb comments_dash
import data
message = "Hello from CREXX"
say message
languages = .StringArrayList()
rc = languages.add("Rexx")
rc = languages.add("CREXX")
i = languages.iterator()
loop while i.hasNext()
say ""Welcome to" i.next()
end
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Ready for a demo.
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Why CREXX
Productive by design
Readable programs, a compact language and a toolchain designed for real systems.
Native and portable
Build and run across current desktop, server and experimental architectures.
Modern language features
Use typed values, classes, interfaces, collections and a growing standard library.
An open roadmap
Follow active compiler, runtime and WebAssembly work in the open on GitHub.
Start building
From download to first program
See how you can write your first compiled-to-native CREXX in a matter of minutes using the installers for Linux, Windows or macOS.
Read the quick start-
1
Install
Choose a release for your platform or build from source.
-
2
Write
Create a compact, readable
.crexxsource file. -
3
Run
Compile and execute through the CREXX toolchain.
Explore
Documentation and resources
Language reference
Learn the syntax and core concepts.
Open guide →Programming guide
Learn how to use the toolchain.
Browse reference →Library reference
Browse packages, classes and procedures.
Browse reference →Virtual machine specification
Write CREXX assembler and see the inner workings of the VM.
Browse reference →Examples
Start from practical, working programs.
View examples →Source and issues
Contribute, report problems and follow development.
Visit the issues page →Get CREXX
Build something clear.
Download the latest beta from the files area.