wxWidgets - wxWidgets: Cross-Platform GUI Library
Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
Electron - Build cross platform desktop apps with web technologies
Optimizely - A/B testing you'll actually use.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Namogoo - Namogoo wins back online stolen revenue by blocking unauthorized ads injected into visitor sessions.