Anonymous CVS access is available for otcl and tclcl from the otcl-tclcl project at SourceForge, and for ns-2, nam-1, and xgraph from the nsnam project; see below.
Remember: Like the daily snapshots, anon-cvs access to ns-2 gets you the current development version. It is not guaranteed to run, compile, or do anything more than take up disk space. Novice users are encourage to use the regular releases (especially ns-allinone), not the snapshots.