SourceForge - The Complete Open-Source and Business Software Platform.
Rainglow Color Themes - 320+ color themes for a variety of editors and software.
openDesktop.org - The website openDesktop.
Slack Themes - Make your Slack pretty with custom themes
OSOR - OSOR is the Open Source Observatory, a project to provide a framework for developing and executing autonomous observations.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.