Command-line JSON processor

A code-searching tool similar to ack, but faster.

Text-mode interface for git

Disk encryption with strong security based on TrueCrypt

Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports.

Low-level unprivileged sandboxing tool used by Flatpak and similar projects

GnuCash Double-Entry Accounting Program.

Bash's powerful command line editing in cmd.exe

Liferea (Linux Feed Reader), a news reader for GTK/GNOME

The systemd project's "logind", extracted to a standalone package

Apache Commons Daemon