Cf. rcarmo/imapbackup: A Python script for incremental backups of IMAP mailboxes
Installed at https://tcp.st/
"Send files through a safe, private, and encrypted link that automatically expires to ensure your stuff does not remain online forever." (ib., 2019-03-10)
"Generic Test for Unsolicited Bulk Email ... in a similar fashion to the EICAR anti-virus test file"
"Graphical application for generating different color variations of a Oomox (Numix-based), Materia and Arc themes (GTK2, GTK3), Gnome-Colors and Archdroid icons and terminal" (ibd., 2018-10-21)
"looks at the YAML metadata in a markdown file and runs pandoc for you" (ib. 2018-09-26)
Not an official PPA of Mozilla but of http://wiki.ubuntu.com/MozillaTeam
"[T]ool to aggregate several remote shells into one. It is used to launch an interactive remote shell on many machines at once." (ib. 2018-09-03)