Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
pickSaaS - Hundreds of SaaS products, analyzed.
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
Look at that SaaS - Inspiration and resources for SaaS founders
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Inside SaaS Sales - 1000+ sales emails and voicemails from top SaaS companies