Retrium - Sprint retrospectives made easy and effective for distributed scrum teams.
Meetric - Super-productive meeting notes, connected to your calendar
Parabol - Agile Meeting Co-Pilot
openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.
TeamRetro - TeamRetro is a secure real-time online retrospective meeting with action tracking and team health checks chosen by amazing teams who love our UI, ease, facilitation features and effectiveness in engaging their people in continuous improvement.
Ring4 Meeting - Dead simple video conferencing - free, in browser