WalletStation

This plugin allows you to create code generators for Xbox Live codes, Amazon codes, Minecraft codes, etc. In order for a 
user to obtain a code, they must go to a url, that you provide, to obtain a password. Once they obtain a password, they enter 
it in the generator to get a code.
Lite Features 
-Create 1 generator.
-Create 10 codes.
-Create 3 URLs per code.
-URLs are randomized.
-Customize generator’s style.
-Generators can be added on posts or pages.
-Codes can only be accessed by one person at a time. A code becomes active once one of its URLs are accessed. If a password isn’t entered, the code becomes non-active in an hour.
-Once a password is entered, the code and its URLs are deleted.
Pro Features 
-Create unlimited generators.
-Create unlimited codes.
-Create unlimited URLs.
-URLs are randomized.
-Each generator has its own style.
-Generators can be added on posts or pages.
-Codes can only be accessed by one person at a time. A code becomes active once one of its URLs are accessed. If a password isn’t entered, the code becomes non-active in an hour.
-Once a password is entered, the code and its URLs are deleted.
<a href="http://walletstation.com/code-generator/" title="Get Code Generator Pro" rel="nofollow ugc">Get Code Generator Pro</a>

Code Generator Lite

anjan011

This plugin focuses on building <a href="https://codex.wordpress.org/Class_Reference/WP_Query#Parameters" rel="nofollow ugc">query parameters</a> for WP_Query object and preview data based on the generated parameters. This is done through various UI component that the plugin provides.
Links
<ul>
<li><a href="https://github.com/anjan011/wp-query-generator" rel="nofollow ugc">WQ Query Generator on github</a></li>
</ul>
<h3>Support</h3>
Got questions? Stuck with an issue? drop me an email at anjan011@gmail.com

WP Query Generator

This plugin generates WP_Query parameters code from a list of supported parameters and lets the user preview data based on the parameters provided.

Code Generator Lite vs WP Query Generator