Hi.
Don't know of any great software only dropshippers (if you learn of any let me know!!) but i have some for electronics and one of them has some software and video games...
www.dbldistributing.com (electronics mostly but they have good prices, and are totally setup for dropshipping)
www.dandh.com (Dropshipping isn't their main thing but have support for it, they have a cool reward point program and have electronics, computer stuff, some video game and software stuff.)