FlashGot is a free Mozilla/FirefoxFirefox/Thunderbird extension, meant to handle single and massive ("all" and "selection") downloads with several external Download Managers for Windows, Mac OS X, Linux and FreeBSD.
FlashGot offers also a Build Gallery functionality which helps to synthetize full media galleries in one page, from serial contents originally scattered on several pages, for easy and fast "download all".

NoScript provides extra protection to Mozilla Firefox, implementing whitelist based pre-emptive script blocking to avoid exploitation of even not known yet vulnerabilities!

SpediFax is a simple cross-platform HylaFAX client, Mac OS X friendly
Requires Java 2 SE 1.3 or better.

Pop3Trap is an interactive POP3 filter written in Java.
Requires Java 2 SE 1.4 or better.