When I first started using Ubuntu back in early 2007 (Ubuntu 6.10) I fell in love with a pre-installed app called Tomboy. I had used Tomboy for several years until Ubuntu One notified users it would stop syncing Tomboy a couple years ago, and then the finality of Ubuntu One shutting down earlier this year. I had rushed to find alternatives like Evernote, Gnotes, etc but none of them were simple and easily integrated.
The Tomboy description is as follows... "Tomboy is a simple & easy to use desktop note-taking application for Linux, Unix, Windows, and Mac OS X. Tomboy can help you organize the ideas and information you deal with every day."
Some of Tomboys notable features are highlighting text, inline spell checking, auto-linking web & email addresses, undo/redo, font styling & sizing and bulleted lists.
I am creating new notes as well as manually importing a few of my old notes from a couple years ago. Tomboy used to sync easily with Ubuntu One. Since that is no longer an option, you can do it with your Dropbox folder or your Google Drive folder (I'm using Insync).
Tomboy hasnt been updated in a while, but it installs and works great on Ubuntu 14.04 using:
sudo apt-get install tomboy
A few quick points. When you sync your notes, it will create a folder titled "0" in whatever folder you have chosen to sync your notes in.
If you want to launch Tomboy with your system startup (in Ubuntu 14.04) in Unity search for "Startup Applications" and run it. Add a new app titled "Tomboy" with the command "tomboy", save and close. Next time you log on, your Tomboy notes will be ready to use.
Tomboy also works with Windows and Mac OS X and installation instructions can be found here:
Windows ... https://wiki.gnome.org/Apps/Tomboy/Installing/Windows
Mac ... https://wiki.gnome.org/Apps/Tomboy/Installing/Mac
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If you are still looking for syncing options, this comes in from Christian....
You can self-host your note sync server with either Rainy or Grauphel...
Learn more here...