It's FOSS - https://itsfoss.com/evernote-on-linux/
Brief: Since Evernote doesn’t have an official client for Linux, we list the best unofficial Evernote clients for Linux.
Evernote is a popular note-taking app with online synchronization and backups. Users can create a note with text and images, audio clips or with attachments, which can be accessed anytime once you login to your account.
Evernote is cross-platform app available for almost all desktop and Mobile OS. However, there is no official Evernote Client for Linux.
You can use Evernote on Linux using the web browser but having an app that works even when there is no internet connection and