You should consider this list a starting point, I doubt it is complete. Also it is only fair to say the ratings are done based on superficial screening of the promotional material on the websites. It is probably worthwhile to do a more in depth comparison, but that will take lost of time. If you find a solution missing please add it to the comments and I will check it out and add it also. If you have experience with one of the platforms your input would be highly appreciated in the comments.
Blogtronix rating: five star
Blogtronix is an Enterprise Social Platform, with a suite of tools including blogs, wikis, documents & social media. These tools allow users in large and small organizations to build internal and external communities, and collaborate in ways far beyond email. Interesting are also the additional packages including LDAP integration, spreadsheets, workflows, compliance,
video blogging, and advanced reports. Available as SaaS, Software, or Appliance.
Brainkeeper rating: one star
Promote themselves as the leader in enhanced collaboration. Although they offer pages, blogs, forums, workspaces and more they focus on wiki and a way for people to connect to each other is missing. There seems to be a lot of functionality, maybe too much as the screenshots look cluttered and surely not a nice, clean and comprehensible web 2.0 style. Hosted and integrates with LDAP.
Firestoker rating: two stars
Enterprise collaboration that puts the user first and gives your business the room it needs to grow. Allowing those in your organization to connect, collaborate and share in a conversational and comfortable setting. Although the only web page of the company looks intriguing the site does not give any information about the product. No feature list, no screenshots, no pricing, nothing.
IBM Lotus Connections rating: three stars
Offers a home page with an overview of social activity, profiles, communities, forums, feeds, wiki, blogs, bookmarks and activities. Complete solution with a modern looking interface.
IBM Bluehouse unrated
Interestingly IBM is developing another collaboration solution, most likely to be offered as a service. It offers file sharing, meetings, chat, forms, contacts, activities and live charts. It is currently in beta.
Microsoft Sharepoint rating: four stars
Platform for sharing information and working together. It has presence, social networking, wiki, blogs, people and group lists, calendars, e-mail integration (provided you use Exchange), tasks, surveys, document collaboration and issue tracking. Integrates seamlessly with other Microsoft products and can be used offline with Microsoft Groove. Highly rated by Gartner.
Novell Teaming rating: three stars
Comprehensive solution, formely IceCore until acquired by Novell, that works in collaboration with other Novell tools. Has teaming workspaces, File sharing, Calendars, Forums, Tasks and milestones, Photo albums and custom folders to create helpdesks and guest books. There is also a conferencing client for IM, chat, Presence, Desktop sharing, Whiteboarding and voice conferencing. Integrates with LDAP. A host of functionality but bad looks. There is a VMware testdrive free for download.
Socialtext rating: five stars
The very recently release version 3.0 offers a personal dashboard, profiles, group workspaces, collaborative document editing, blogs, comments and ratings, revisions, wiki, notification, mobile access, offline use and feeds. It is Open Source and available as appliance or SaaS based.
System One rating: one star
Combines social software, semantic web and information retrieval technologies and runs as a service in standard web browsers. It looks like a wiki combined with contextual display of email, files and documents. It is supposed to work associatively, intuitive and flexible. It is a web-service, either delivered through a central data center or on premise hosting. It’s hard to find any real information on what it does, but its there, somewhere.
Sonar rating: two stars
This suite from Trampoline Systems maps expertise, interests and relationships across the business and its external contacts by analysing email, contact data, documents, wikis, blogs and other corporate data. It has a portal (Sonar Dashboard) for employees and a desktop application for managers. It was one of the Red Herring 100 winners in 2008. Hard to find real information about what it does on the website.
Thoughtfarmer rating: five stars
ThoughtFarmer is next-generation intranet software: wikis, blogs, discussions, feed, profiles, documents and social networking for effective internal collaboration. Distinguishing is that multi language and organizational chart. It runs on Windows and MYSQL and integrates with LDAP.
Know others or have an opinion on one of these: use the comments.