Shia Source
Islamic Multi-media library. Audio, Video, Reciters, Wallpaper.

The Dawn Foundation
Online platform which aims to nurture a Shia Muslim community. 

Rafed.net
Cultural development.

ShiaTV
Muslim Shia videos: movies, speeches, hadith, poetry, supplications, children, fiqh, funny, news.

Duas.org
This is an Islamic Supplications site, hosting all duas as taught by the Holy Prophet (saws) & his Holy Progeny, Ahlulbayt (as).

Imaan Designs
Islamic Graphic Art.

Q Fatima
Innovative, educational material.

Hussainiat
Videos, tafseer, audio books, duas, lectures etc.

Shia Apps
List of the best mobile apps out right now.