Grape is an REST-like API framework for Ruby. It's designed to run on Rack or complement existing web application frameworks such as Rails and Sinatra by providing a simple DSL to easily develop RESTful APIs. Developed by UberGrape GmbH
License: Commercial
Grape is primarily designed for project management and collaboration, offering a user-friendly interface with excellent integrations. Mattermost, on the other hand, is focused on team communication, providing robust security and self-hosting options, making it suitable for organizations with specific compliance needs.