Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
DonorSnap - DonorSnap is a donor management and fundraising software.
UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
DonorPerfect - Nonprofits use DonorPerfect Fundraising Software for their Donor Management, Grant & Gift Tracking, Moves Management, Mass Mailing needs and more.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
NetSuite for Nonprofits - NetSuite for Nonprofits is a cloud-based donor management system for your nonprofit or social organization.