My small team (two network people, one sysadmin, two devs, one manager) gets a lot of mileage out of DokuWiki for project and systems documentation. It's fast, has good plug-ins, and stores pages in the filesystem, which we consider a plus because it makes backups and versioning a snap.
When we're collaborating with larger groups, though, we tend to pick Redmine by default. It offers a nice combination of ticketing, project management, and documentation features, without the learning curve of a traditional wiki or the deployment headaches of something like Confluence.
When we're collaborating with larger groups, though, we tend to pick Redmine by default. It offers a nice combination of ticketing, project management, and documentation features, without the learning curve of a traditional wiki or the deployment headaches of something like Confluence.