- (claimed) global scm solutions
 -> (proprietary) clearcase, cm synergy (http://www.telelogic.com/products/synergy/cmsynergy/index.cfm), ...
- history
 -> rcs, sccs, cvs, prcs, arch/tla, opencm, vesta, ArX, shapetools,
    monotone http://www.venge.net/monotone/), ...
 -> (proprietary) perforce, bitkeeper, teamware, continuous, ...
- difference
 -> diff, ediff, tkdiff, ...
- merge
 -> ediff, meld, ...
- build/dependency
 -> make, jam, cook, ...
- network transparency ?
 -> nfs, ...
- bug-tracking
 -> bugzilla, mantis, requesttracker, debbugs, sourceforge::tracker, savannah::tracker...
- changeset lifecycle
 -> aegis
- virtual filesystem
 -> cvsfs, vcfs, libatfs, ...
- testing tools
 -> junit, ...
 -> (proprietary) attol, ...
- consistency checker/enforcer
 -> aegis, tinderbox, guilty, ...