Lotus Notes
Notes is not a requirements tool as such, but is very effective place to store requirements specifications. Set up a new Notes database for each specification, and give access to all the stakeholders. Use DocLinks to link to documents that have some relation to your specification - interview notes, meeting minutes. Attach the function point counts to the requirements, then link each of them to the appropriate design documents. Release 5 now includes a bookmark bar that creates quick links to frequently needed information and support for a universal Internet mailbox - whether they're on a Lotus Domino server or hosted by an Internet Service Provider (ISP).
updated June 2011