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.

Viktor Szépe

Have you ever needed to upgrade a plugin to it’s latest (unreleased) version? 
With SVN Updater you get a new action (Trunk) on the Plugins page.
Development of this plugin is done <a href="https://github.com/szepeviktor/svn-updater" rel="nofollow ugc">on GitHub</a>. 
Pull requests are welcome.

SVN Updater

Works well for such a simple plugin.
WordPress is lacking in a good way to phase users in to major plugin updates. (either you manually install from trunk, or get a surprise as soon as the stable tag changes)
I'd love to see this worked into a more fully fledged "beta tester" plugin that hooks into auto-updates when the dev version is bumped.



Just what I needed

Install any WordPress.org plugin's trunk version from SVN.

Show SVN Revision vs SVN Updater