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Yuki is a manga search tool for a long list of websites. Cross platform.

Verdict: not portable; writes settings to HKCU\Software\JavaSoft\Prefs\yuki\main

Requires: Java

http://www.redsquirrel87.com/
http://www.softpedia.com/get/Others/E-Book/Yuki.shtml

I looked into this as I thought this might be an alternative to FMD or HakuNeko, but it turns out it's not a downloader.
Disk: 388 KB

Still in development, now at v56: https://redsquirrel87.altervista.org/do ... loader#v56

Nothing in the changelog about portability so won't restest.