NeverNote:
This is an open source clone of Evernote. This program has been run on Linux, Windows, and OS-X, but the primary goal is to proved a Linux client. While this is designed to work with Evernote, it is in no way connected with or supported by Evernote. Any problems you encounter will not be corrected by them and, since this is GPL software, you are using this software at your own risk.
It workes perfectly with Evernote, you only need to register on Evernote using Evernote the first time from a Windows machine or a smartphone.
If there was a portable version of nevernote you could access modify and synconize your Evernote data from anywhere
oh, I forgot:
http://nevernote.sourceforge.net/
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Nevernote is natively portable, depending only on Java.
I did took a regshot and there's a lot of stuff to take care of. I was having trouble running it though, when moving directories, so I decided not to make it.
IMHO more valueable is that with NixNote / NeverNote Version you can edit note's HTML source, with Evernote - can't
https://sourceforge.net/mailarchive/message.php?msg_id=27857013
Finally, I'd like to point out that this release adds the ability to view and edit the source HTML of a note. This can be useful if you have problems saving a note or to tweak the formatting. The thing to remember is that it will still try to cleanup any invalid HTML so it can be synchronized with Evernote, so formatting may still be modified after saving. It also won't prevent you from doing anything foolish like editing encrypted text or changing resource GUIDs so be careful.
othervise you have to use online bookmarklet ENML Editor
http://enml-editor.ping13.net/
Get your hands dirty with your Evernote notes.