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Alternative PHP Cache, is a free open-source opcode (operation code) caching plugin for PHP. If your host has installed APC cache this plugin allows you to flush the cache from within WordPress. Once activated, go to Tools -> Purge APC to send the command to flush the APC cache.
The plugin returns either ‘Success’ or gives a detailed error message if it is unable to run the command successfully.
Original Author: TJ Stein, inspired by Kaspars Dambis of konstruktors.com

APC Cache Purge

This is a simple, single purpose plugin to flush the APC cache.

Mark Jaquith

APC Object Cache provides a persistent memory-based backend for the WordPress object cache. APC must be available on your PHP install.
An object cache is a place for WordPress and WordPress extensions to store the results of complex operations. On subsequent loads, 
this data can be fetched from the cache, which will be must faster than dynamically generating it on every page load.
The APC Object Cache backend is also compatible with <a href="https://wordpress.org/extend/plugins/batcache/" rel="ugc">Batcache</a>, the powerful full page caching engine that runs on WordPress.com
Be sure to read the installation instructions, as this is not a traditional plugin, and needs to be installed in a specific location.

APC Object Cache Backend

APC Object Cache provides a persistent memory-based backend for the WordPress object cache. APC must be available on your PHP install.

APC Cache Purge vs APC Object Cache Backend