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digiacom

Display and manage volunteer projects for any purpose.
<ul>
<li>Registers custom post type <code>wp-vpm-projects</code></li>
<li>Registers metaboxes to the editing screen for project meta fields</li>
</ul>
This plugin is in beta, and is not yet appropriate for a production site.
Important features like post ordering and administrative settings are absent.
That said, perhaps you will find it useful!
This plugin is in use over at <a href="http://www.volunteerwild.org" title="Conservation stewardship in Durango, Colorado" rel="nofollow ugc">Volunteer Wild</a>

WordPress Volunteer Project Manager

Display and manage volunteer projects for any purpose.

ghostinajar

Signups allows you to easily create and manage signups for your school, organization or event.
For more features, check out Signups Pro here: 
<a href="http://www.ghostinajar.me/software/signups-pro/" rel="nofollow ugc">http://www.ghostinajar.me/software/signups-pro/</a>
Use it for:
<ul>
<li>School Sign Ups</li>
<li>Volunteer Sign Ups</li>
<li>Church & Temple</li>
<li>Fundraising</li>
<li>Scouting Events</li>
<li>Family Events</li>
<li>Sports Events</li>
<li>Potluck Invites</li>
<li>College Activities</li>
<li>And many more!</li>
</ul>

Signups

Signups allows you to easily create and manage signups for your school, organization or event. Unlimited number of Clipboards and unlimited number of …

WordPress Volunteer Project Manager vs Signups