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

Clientjoy.io - Productivity OS for Agencies & Freelancers | All-in-one crm to Manage Sales Pipeline, Clients, Appointments, Mailbox, Create Proposals, Contracts, Invoices, collect Payments & run Email Sequences.

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

Albacross - The world's first free B2B Lead Generation Network. Albacross help companies master their B2B digital marketing with Lead Generation and targeted marketing

HelpScout - Help Scout is a simple, straightforward way to provide excellent support

mightysignal - The engineer's approach to lead generation.