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

Donorhut - Donorhut offers cloud fundraising software for charities and non-profits of any size.

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

Txt2Give - Txt2Give helps churches, non-profits, schools, alumni associations, and political campaigns receive donations with text messages.

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

Little Green Light - Illuminating Data. Advancing Nonprofits.