wptimeslots

See http://www.wptimeslots.com for more info!
<ul>
<li>Show the availability of anything per hour per day</li>
<li>Mark a time slot as free or booked, for example 08:00 – 09:00</li>
<li>Generate a token to insert the calendar in a page or post or use it as a widget</li>
<li>Can be translated in any language with Poedit</li>
</ul>
Features of the full version:
<ul>
<li>Custom time slot steps! Like 12:00 – 12:05 (every 5 minutes) or every 10 minutes and so on.</li>
<li>Show multiple days</li>
<li>Create an unlimited number of calendars</li>
<li>Show or hide the days in a drop down menu</li>
<li>Only $15 (no yearly costs!)</li>
<li>Download directly without registration</li>
<li>Not satisfied? Money back guarantee!</li>
<li>Download the full version at: http://www.wptimeslots.com</li>
</ul>

WP Time Slots

See http://www.wptimeslots.com for more info!

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 …

WP Time Slots vs Signups