Functionality necessary to run the Erlang System itself
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A library for wxWidgets support in Erlang
A Graphics System used to write platform independent user interfaces.
A set of programming tools including a coverage analyzer etc
The System Architecture Support Libraries
The System Architecture Support Libraries is a set of tools for release upgrades and alarm handling etc.
Reltool is a release management tool. It analyses a given Erlang/OTP installation and determines various dependencies between applications. The graphical frontend depicts the dependencies and enables interactive customization of a target system. The backend provides a batch interface for generation of customized target systems.