Crystal Programming Language

Copyright 2012-2026 Manas Technology Solutions.

This product includes software developed at Manas Technology Solutions (https://manas.tech/).

Apache License v2.0 with Swift exception applies to all works unless specified otherwise:

Please see REUSE.toml and LICENSE for additional copyright and licensing information.

• This repository includes vendored libraries (shards) in /lib/ which have their own licenses. See REUSE.toml for details.
• Crystal playground includes vendored libraries with their own licenses. See src/compiler/crystal/tools/playground/public/vendor/REUSE.toml for details.

External libraries information

Crystal compiler links the following libraries, which have their own license:

• LLVM - Apache-2.0 with LLVM exceptions
• PCRE or PCRE2 - BSD-3
• libevent2 - BSD-3
• libiconv - LGPLv3
• bdwgc - MIT

Crystal compiler calls the following tools as external process on compiling, which have their own license:

• pkg-config - GPLv3

Crystal standard library uses the following libraries, which have their own licenses:

• LLVM - Apache-2.0 with LLVM exceptions
• PCRE or PCRE2 - BSD-3
• libevent2 - BSD-3
• libiconv - LGPLv3
• bdwgc - MIT
• Zlib - Zlib
• OpenSSL - Apache-2.0
• Libxml2 - MIT
• LibYAML - MIT
• readline - GPLv3
• GMP - LGPLv3

<!-- licenses --> <!-- libraries -->