OP said he wanted an open source solution. Other than that, I can find no faults in using Evernote for this purpose. I use it for my personal stuff. Where Ever

OP said he wanted an open source solution. Other than that, I can find no faults in using Evernote for this purpose. I use it for my personal stuff. Where Evernote falls down, and this is by design according to CEO Phil Libin, is in sharing across many people. Libin says Evernote is not social, it's anti-social. As such, it doesn't work when you need to collaborate on notes. But see Evernote Business which seems to contradict this assertion. OP was talking about a personal solution so the social aspect doesn't apply.