gpgkeymgr is a tool for cleaning up and managing your GnuPGP key ring. It removes old and unnecessary keys according to user-specified criteria. For example, you can remove all expired or revoked keys, or all keys you don't trust, and much more.
A tool for figuring out who pays what to whom after a series of transactions among members of a group.
A heterogeneous set of I2C tools for Linux.