The Commonist is a batch file uploader for MediaWiki sites that support api.php (the Commons, #Wikipedia, etc.). Commonist loads files from a directory, displaying thumbnails for each file (for supported types). Details can be added on a batch wide or per image basis. Once details are entered files can be selected for upload and quickly uploaded.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.