jwpegram

This plugin protects your WPMU signup process against spambots with a simple math question. This plugin is based on the <a href="https://wordpress.org/extend/plugins/block-spam-by-math/" rel="ugc">Block-Spam-By-Math</a> plugin created by <a href="http://www.grauonline.de" rel="nofollow ugc">Alexander Grau</a>. This only protects the new blog creation process and the new user creation process. If you wish to have individual blog protection use the regular Block-Spam-By-Math plugin on individual blogs.
<h3>Help</h3>
For additional help check the plugin page at: http://www.jamespegram.com/wpmu-block-spam-by-math/

WPMU Block Spam By Math

This plugin protects your WPMU signup process against spambots with a simple math question.

Ishimwe

This plugin acts as a quick front-end posting tool, allowing your visitors to easily submit posts and images from the front-end of your site, via a sidebar widget form, or a custom shortcode in a page or post of your choice. 
This is a very easy way to get your visitors to engage on your website. The idea came from a client who wanted a way to let members of their congregation post articles in the main church’s website 
Some of the niches this plugin can be useful include:
<ul>
<li>Blogging website with many contributors</li>
<li>Community webstes with user participation/interativity</li>
<li>Forum like websites that don’t want to use a fully featured forum module/plugin</li>
<li>Classified ads website where users post and review others’ posts</li>
</ul>
and more
This plugin is fully localizable with .po file included. The .mo for French is included
You can join/follow the discussion about the plugin on its home page at http://www.codiiv.com/forums/forum/plugins/sidebar-post/
<ul>
<li>Twitter: https://twitter.com/codiiv</li>
<li>Facebook: https://www.facebook.com/codiiv.com</li>
<li>Github: https://github.com/codiiv</li>
</ul>

Sidebar Posting

This plugin allows your visitors (logged in OR Not) to submit posts to your site via a simple sidebar widget form.

WPMU Block Spam By Math vs Sidebar Posting