troyvit

It doesn’t take much to prove that computers are idiots, but most captchas go too far. Captchas based on graphics don’t work with blind people yet they dominate comment forums. This is a logical captcha that uses math and simple riddles to weed out the machines. This plugin comes with 10 predefined questions and the ability to add more. The math part isn’t too hard and can be disabled if you’re dealing with people who don’t like math. This plugin relies on php sessions to store information.

Text Captcha

Text Captcha uses riddles and math to make sure your posters are real instead of computers.

oaron

infoalap

Alt checker is a WordPress plugin which can determine whether the alt attribute associated to your uploaded pictures is properly filled in. This attribute improves your webpage’s accessibility, please use it to support blind users.
<h3>License</h3>
This file is part of Alt checker.
Alt checker is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Alt checker is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Alt checker. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Alt checker

When pasting images, alchecker checks whether alt attributes are correctly filled.

Text Captcha vs Alt checker