erlang/otp

This system is the Erlang/OTP runtime environment and standard library, providing the foundational infrastructure for building concurrent, distributed, and fault-tolerant applications. It encompasses the Erlang runtime system (ERTS) with modernized JIT compilation, native I/O handling, and improved threading, alongside a comprehensive suite of standard library modules for networking, cryptography, and data processing. The codebase has been significantly refactored to use Markdown-based documentation, Apache 2.0 licensing, and modern build systems, while removing legacy components like HiPE and CORBA.

The project underwent a comprehensive license migration from the Erlang Public License to the Apache License 2.0 across the entire codebase. This period also involved modernizing the build system, documentation formats, and removing deprecated or obsolete components such as HiPE, VxWorks support, and various legacy applications.

157 changes

This period focused on modernizing the Erlang runtime's concurrency and performance foundations, most notably by introducing a modular, cross-platform JIT compiler backend for x86 and ARM64 architectures. Concurrently, the team significantly expanded test coverage across the compiler, ASN.1, and emulator components, while also implementing critical low-level threading and atomic operation improvements for Unix and Windows platforms.

57 changes

This period focused on expanding test coverage for the SSA compiler, binary suite, and doc chunk generation, while introducing safe generators for property-based testing. Additionally, the project established compliance infrastructure through ORT configuration and updated bundled libraries like Zstandard and AsmJit.

10 changes

erlang/otp was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.