Inverse - Team conversations and knowledge sharing on any webpage
Front - multi-channel inbox service for collaborative teams
Client Proofing by Pixpa - Share, proof and deliver your work to clients.
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
Task Pigeon - Create, assign & manage your teams everyday tasks
Missive - Team communication app now supporting FB, Twitter & SMS