"client only bidirectional file synchronizer", used by ownCloud/Nextcloud
"Proprietary peer-to-peer file synchronization tool available for Windows, Mac, Linux, Android, iOS, (...). It can sync files between devices on a local network, or between remote devices over the Internet via a modified version of the BitTorrent protocol." (Wikipedia, 2018-01-21)
"Linux-enabled laptops and desktops"
"LaTeX editor for the GNOME desktop. ... The idea of LaTeXila is to always deal directly with the LaTeX code, while simplifying as most as possible the writing" (ib., 2017-03-07)
"animation software for both bitmap and vector graphics"
See also https://github.com/pencil2d/pencil
"AutoKey is a desktop automation utility for Linux and X11. It allows you to manage collection of scripts and phrases, and assign abbreviations and hotkeys to these. This allows you to execute a script or insert text on demand in whatever program you are using."
"Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Your data is your data alone and you deserve to choose where it is stored, if it is shared with some third party and how it's transmitted over the Internet."
"cluster synchronization tool. It can be used to keep files on multiple hosts in a cluster in sync."
"Open-Source Free Cross-platform Multi-protocol VPN Program"