Twist!

Mattermost is an open source, self-hosted Slack alternative.

With Skarpline, you can chat directly on any card. For teams that use files and links, this can be a huge timer saver. Instead of attaching a file to an email you can now same time by communicating on the file itself. The more emails and versions you have, the more powerful and time saving Skarpline becomes.

Stride is the complete team communication solution with group messaging, video meetings, and built-in collaboration tools. Try free today!

Zala is a free messaging app available for iPhone, iPad, Android, smartphones, tablets, laptops and desktops. Zala uses your device’s Internet connection (LTE/4G/3G/2G/EDGE or Wi-Fi) to send and receive messages, checklists, photos, videos, audio files, documents and voice messages instantly with co-workers, friends and family!