Is there a Evernote client?

Not an official one, but I've had success with the unofficial client NeverNote

I believe they dont have linux support but here is a cool article on various alternatives.

On Linux, you can use NixNote (previously Nevernote), an unofficial Evernote client written in Java but if you want something lightweight, you should try Everpad, a new Evernote client that integrates nicely with Unity.

It supports online sync, notes, tags, notebooks, file attachments (remember there's a 60 MB monthly limit) and places.

Installation:

To install Everpad all you need to do is run the following commands in terminal:

sudo add-apt-repository ppa:nvbn-rm/ppa
sudo apt-get update && sudo apt-get install everpad

Once installed all you need to do is search for ‘Everpad’ in the Unity Dash and then run the Everpad application. You will then see the app indicator appear on your panel. Once it does, click on it and select “Settings & Management” then “Authorise” to configure Everpad with your Evernote account.

To create a new note, simply click on the Everpad app indicator and select “Create Note” or click on an existing note to edit it.

Troubleshooting:

Having a issue? Report them @Github

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Sources: Omg Ubuntu!