fs2svn is a new, free, open-source tool that converts a bunch of archive folders into a Subversion repository.
If you’ve kept a series of historical snapshots of your work in folders, fs2svn can help you upgrade to a full-fledged version control system.
fs2svn goes through all the folders under a given parent folder (in filesystem order) and creates a Subversion revision for each one, backdated to the most recent file’s last modified date. The log message is set to the folder name.
Additions, changes, and deletions between one folder and the next are all recorded in the repository.
The input format is very simple. It only covers the mainline trunk, not any tags or branches (though tags for major versions could be manually created later, if your folder names carry enough information).
The format is so simple it could be used as a common intermediary. If you wanted to migrate a mainline trunk from some exotic version control system to Subversion, you could write a script to export it to regular folders, then use this script to import the result into Subversion.
See the main fs2svn page for information, examples, and to download.