Co-op, a no-frills application with a simple user interface similar to Twitter's, is free for everyone.
Features: Post updates, ask questions, share links, track time. Co-op also lets you share your daily agenda with your coworkers, so everyone knows your current projects. The Web app automatically stores records of activity, allowing you to review what your team has accomplished each day.
How are others using microblogging in the enterprise? Click here for three case studies.
Cynapse's Cyn.in open-source community edition has a robust collection of enterprise collaboration tools. Three versions of the tool are available; the free community edition includes Active Directory integration, application source code, Web-based appliance management console and more. The other editions sell for approximately $4,500/year to $15,000/year.
Features: Wikis, blogs, file repositories, event calendars, discussion boards, image galleries, collaboration spaces, status logs, people directory, crowd rating and voting and more.
CubeTree, recently acquired by SuccessFactors, is an on-demand enterprise collaboration suite available in free and premium versions. The free version includes user profiles, microblogging, file sharing, wikis, and 10MB per user.
Features: Suite includes standard microblogging characteristics. Status updates of 140 characters; a commenting feature (similar to commenting on activity streams on Facebook); feed filtering, which lets you choose who to follow and what feed items you'd like to receive; direct addressing (similar to Twitter's @name function); and integration with several third-party systems.
Hashwork doesn't require a company administrator; sign up by entering a work e-mail address and you'll become part of your company's community on Hashwork. User interface and function is very similar to Twitter. You get more management features with paid versions.
Features: 140-character posts, direct addressing, groups, hashtags.
Jaiku is a tool similar to Twitter, but powered by Google. Jaiku is free for everyone.
Features: Updates can be posted via Web, instant message and SMS, as well as through third-party applications built by other developers. Jaiku also lets you include icons in your messages, customize your background, add Web feeds and set your location.
Obayoo's enterprise collaboration tool rolls a number of standard tools into a comprehensive package that includes a private network for your company. It's free for everyone.
Features: Activity streams let you connect with colleagues and see what they're working on; ability to archive messages; create unlimited groups; connect with clients and contractors via invitations; share files, images and Websites; guaranteed SSL protection.
Present.ly's free, SaaS service is hosted on its secure servers. Upgrading to Present.ly's enterprise-grade solution lets you host the application behind the firewall and is suggested for midsize to large organizations with existing IT infrastructure.
Features: Post short updates that are tracked or "followed" by others. Present.ly is secure and private; messages are not visible to the outside world. Present.ly also includes groups to keep conversations organized and the ability to share documents and media with coworkers. Present.ly can be accessed via desktop, iPhone, Andriod, BlackBerry, Windows Mobile and Sharepoint.