GiveSmart - GiveSmart offers mobile bidding and event management for charity fundraisers .

Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.

Handbid - Generate more revenue and delight your bidders with the Handbid mobile bidding silent auction software with apps for iOS, Android, and the web.

Kindful - Nonprofit donor database + fundraising tools all in one

HiBid - Auction

Classy - Expressive, flexible, and powerful stylesheets for native iOS apps