deb-get
`apt-get` functionality for `.deb` packages published in third party repositories or via direct download.
TLDR
Update the list of available packages and versions
$ sudo deb-get update
Search for a given package
$ sudo deb-get search [package]
Show information about a package
$ sudo deb-get show [package]
Install a package, or update it to the latest available version
$ sudo deb-get install [package]
Remove a package (using purge instead also removes its configuration files)
$ sudo deb-get remove [package]
Upgrade all installed packages to their newest available versions
$ sudo deb-get upgrade
List all available packages
$ deb-get list