Base on the atomPub Publishing Protocol, atomPub Manager allows you to publish local content to the Web, and you can manage remote Web content locally (Create, Remove, or Set Resource Category).
Aeterean-a is an automatic image downloader. You just have to type a search term, and Aeterean-a downloads many pictures from Google. It features a lot of download settings like picture size, color, and type.
A mature implementation of a SIP server/proxy.
A multiplatform Modbus library.