KVirc

If you want an IRC client that is as full featured as MIRC you have it with KVirc. I have to admit I'm very impressed by the feel of this client. It really outdoes MIRC in the look and feel department. Not to mention that it has built in encryption for private messages/queries. There is SSL support and support for proxies(like TOR), sound, voice-chat, and has a scriptable interface.

The current 'stable' release isn't portable though, you need one of the development releases. The most current one will be fine.

Portable Prism -Final-?

I did a quick once by of Prism. Same as Webrunner, and them same as other Mozilla apps for that matter. I can't actually recommend anyone use this, as https connections are a pain to setup with this and require loads of testing to make a proper "Webapp" file. But there it is. I'm going to uninstall Prism now.

Portable Prism Update

In my attempts to begin working on a portable I looked at my previous posts covering making Firefox and Thunderbird both portable. I figured, sure why not and behold the same method works on Webrunner. But tthere is a trick, you need a basic profile. And to create that you need the profile manager(which webrunner also has).

First start webrunner via command line:
Webrunner -p -turbo

And then make yourself a profile folder. Copy it whereever you plan to store your data on your Device and then from command line fire off:
webrunner -profile "[Profile path on USB device]" -turbo

Note I haven't tested this on Prism yet, but you can expect an update soon.