All programs listed below are free and under Zlib license. Source code is included (C#).
Steam uploaderGUI for uploading builds to Steam.
Itch uploaderGUI for uploading builds to itch.io.
Stream SuiteAutomates streaming tasks. With the click of a button, posts a Twitter message, posts a Discord message, sets the Twitch title to today's date, and runs a countdown timer for the stream pre-roll.
Changelog BotSends TortoiseSVN commit messages to a Discord channel.
I wrote about how it works here.
Workshop UploaderProgram for uploading Steam Workshop items. Originally written for Quadrilateral Cowboy but can be repurposed for other games.
TGA ViewerViews TGA image files. Only TGA files. Absolutely no other image formats.
(Honestly you should use XNView instead)