GtkSourceView is a text widget that extends the standard GTK+ 3.x text widget GtkTextView. It improves GtkTextView by implementing syntax highlighting and other features typical of a source editor.

Reviewing changes involves reading diffs. Sometimes, a line-oriented presentation of changes is not precise enough, especially when changes involve long lines or very similar consecutive lines.

The lttoolbox contains the augmented letter transducer tools for natural language processing used by Apertium, a platform for building rule-based and hybrid machine translation systems. The software is also useful for making morphological analysers and generators for natural language processing applications.

SecondString is a Java toolkit for developing and evaluating approximate string comparison operators. It includes abstract classes for various edit-distance based comparators and concrete implementations of several published approximate comparators.

OpenDHT is a lightweight C++17 Distributed Hash Table implementation.

This provides a convenient API for generating per-user self-signed root certificates, is useful for development.