When comparing Yammer vs Gitter.im, the Slant community recommends Gitter.im for most people. In the question“What is the best team chat software?” Gitter.im is ranked 11th while Yammer is ranked 37th. The most important reason people chose Gitter.im is:
Integrations for Trello, Jenkins, Travis CI, Heroku, Sentry, BitBucket, HuBoard, Logentries, Pagerduty & Sprintly are available.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro User interface is modelled after Facebook
To make it easier to learn for new users and increase adoption.
Pro Hashtag support
Hashtags help organize projects and parts of projects easily. Great for getting an overview of a specific subject and seeing if something's missed.
Pro A complete social network for business
Yammer works like a typical social network with status updates, comments, file sharing, groups, etc.
Pro Has many developer-friendly integrations
Integrations for Trello, Jenkins, Travis CI, Heroku, Sentry, BitBucket, HuBoard, Logentries, Pagerduty & Sprintly are available.
Pro Unlimited public and private rooms for free
Pro Has full Markdown support
Pro Has an IRC bridge
Pro Has apps for OSX, iOS and Chrome
Pro Has a Windows 8 app
Unofficial app for Gitter.im is currently available.