Apex currently includes over 30 site configs and more will be added on a regular basis.
With Apex you can select multiple site configs and have them check for accounts at the same time.
You can use HTTP/S, SOCKS4 or SOCKS5 proxies with Apex.
Apex saves hits automatically, each config will save a text file containing the hits it found.
You can search through your hits or filter them with a range of options.
You can get a list of HTTP/S proxies to use with Apex using the Proxy Grabber, it's simple and quick.