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

PartnerStack - GrowSumo helps growing companies increase sales, signups, and leads through partnerships Whether you're starting fresh, migrating a partner program, or ready for hyper-growth - we're ready, are you?

UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.

Invite Referrals - Invite Referrals is the simplest tool to design and launch customer referral campaigns.

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

Impact - Impact Partnership Cloud is an affiliate marketing tool that helps businesses to manage the entire lifecycle of partnerships from recruitment to incentivization.