Why should we limit use of PHPUnit to test the features we built only? Some failures are often due to server side configuration errors in php.ini file. My effort here is to ensure that the server always runs under your specific consideration.
An essential lists and comparisons of useful Web Tools, Platforms, Services and Providers as seen on Wikipedia and few other websites. These links are external bookmarks.
Some applications are often mutually exclusive; you may use one of them. Though they are NOT the drop-in replacement, their purpose is pretty similar.
Installation methods of Official and Non-Official WordPress Plugins differ by a little bit only.