KM software for brainstorming

Individuals and small groups use KM software as a platform for brainstorming and analysis, and for cataloging, organizing, structuring, and searching disparate sources of information or data and arranging them into an accessible format.

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DEVONthink is designed to collect and organize all of your digital files, including everything from PDFs, emails, and Word docs to multimedia files and active hyperlinks.  Its artificial intelligence engine categorizes and cross-references your information, while remaining flexible to your preferences and adapting to your input. 
TheBrain Technologies provides visual information management solutions, placing information on a dynamic, multi-dimensional interface, unfettering your ideas from the limitations of typical outline and list structures.  The company offers PersonalBrain for individual users and knowledge management and groupware app BrainEKP for enterprise use.

KM software for collaboration (groupware)

Groupware provides a virtual space where members of a company or project team can access key files, pose questions, and coordinate their workflow. This collaborative style of KM software can be especially helpful to companies with remote workers or freelancers and the resulting need for a centralized resource where key information can be stored and accessed. More and more web-based groupware solutions are becoming available all the time. They leverage the flexibility, ease of access, and cost-effectiveness of the web as they facilitate information sharing.

I recommend: 
37 Signals offers innovative, secure, and user-friendly web-based collaborative tools, including Basecamp, a project-based collaboration and knowledge management solution with integrated scheduling, task assignment, file organization, and messaging features. 

KM software for customer service agents

Many companies seek to bolster the quality of their customer service efforts by providing their reps with knowledge management software. This is particularly effective in the complex field of technical support. A user-friendly KM software suite can help keep customer service agents confident, educated, and up-to-date. Many knowledge management application integrate with call tracking systems which pre-populate questions, allowing an agent to move towards issue-resolution without delay. The call tracking system can automatically log the exchange, thus capturing valuable feedback data.

I recommend: 
UK-based eGain KnowledgeAgent offers all of those features, as well as the ability to handle multi-lingual content and global deployment. 
Talisma Knowledgebase combines a help desk and FAQ knowledge base with customer support tools to create a web-based, enterprise-level KM software solution which can integrate with many popular legacy CRM apps.

KM software insight from the experts

Since 2000, KM World magazine has released a ranked list of the top 100 companies active in the knowledge management software market. Their comparative study uses customer feedback and an expert panel to evaluate the innovation and ease-of-use offered by each KM software company.

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KM World.com features white papers, a buyer's guide, and research reports.
Information Week.com delivers news, reviews, analysis, trends, and whitepapers covering the latest in business technology and software.