当然， Evernote 很棒。

An open-source, self-hosted note-taking solution designed for seamless deployment and multi-platform access. Experience effortless plain text writing with pain-free, complemented by robust Markdown syntax support for enhanced formatting.

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor. The notes are in Markdown format.