Erlang/OTP R16B has been released! Erlang/OTP R16B has been released. OTP R16B is a major release with a number of new features, improved characteristics and also some minor incompatibilities. We would like to thank all of you that tested the beta release (R16A) and gave us valuable feedback. See the Readme file and the Documentation for more details.

R16B Readme File

R16B Source File (63.9 MB)

R16B Windows 32-bit Binary File (89.6 MB)

R16B Windows 64-bit Binary File (90.7 MB)

R16B HTML Documentation File (31.3 MB)

R16B Man Pages File (1.2 MB)

Some of the highlights are:

  • Optimized handling of processes in the VM
  • New internal process table allowing for parallel reads and writes
  • optimized run queue management
  • optimized process state changes
  • "Non-blocking" code loading
  • New internal port table, and rewrite of scheduling of port tasks.
  • Dynamic allocation of port structures, allowing the default for maximum ports to be raised to 65536 (from 1024)
  • Support for UTF-8 encoded Unicode characters in source files.
  • Inets application: The http client now support HTTPS through a proxy
  • Asn1 application: Major cleanup of back ends and optimizations of mainly decode for PER and UPER.
  • Support for parameterized modules (but an alternative solution provides) and packages removed
  • All built in functions BIF's (even if they are implemented in C as part of the VM) are now visible in the source code of the module they belong to, including their type specs.
  • The Wx application now compiles and is usable with the unstable development branch of wxWidgets-2.9. This means that wx can now be built on 64 bit MacOsX as well.

Additional Packages

Erlang/OTP is also distributed in pre built packages courtesy of Erlang Solutions.
There are pre built packages for platforms such as: Raspbian, Ubuntu, Fedora, OS X, and more!.
Erlang Solutions Downloads page


From OTP 18 and above, Erlang/OTP is distributed under Apache License 2.0. The previous versions are distributed under the Erlang Public License (EPL) that is a derivative work of the Mozilla Public License (MPL). It contains terms which differ from MPL, mainly in terms of jurisdiction. The license is constructed in accordance with the laws of Sweden.

To help you understand the legal text there is an EPL Translation. The legal text is the license, so if you have any doubts, refer to the legal text.

Available releases

PDF files are included in the Windows installer and in the HTML documentation tarballs, starting with the R13B03 release.

There is a file containing MD5 checksums for all files in the download directory, also reachable through rsync

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