DanCoulter

This plugin allows WordPress testers and administrators to display the revision and path of the Subversion working copy that their WordPress installs are running on. The information goes into a line in the admin footer. This line can be removed in favor of a tooltip if that is preferred (see installation instructions).

Show SVN Revision

Adds the revision and path of your Subversion working copy to the admin footer.

flashpixx

This plugin is not be in developing anymore, all functionality is moved to a new plugin <a href="https://wordpress.org/extend/plugins/repositoryzip/" rel="ugc">Repository Zip</a>
The plugin creates zip download links within articles and pages of a subversion repository. On each call the subversion revision number, link text, css name and download 
name can be set, so that each link points to different subversion. The plugin need no configuration or something else.

SVN Zip

With this plugin a zip download link of a subversion repository can be created within blog articles and pages

Show SVN Revision vs SVN Zip