Open source note taking and to-do app with synchronization
...Joplin is available for Windows, Linux, macOS, iOS and Android, with three types: desktop, mobile and terminal. All of them have similar user interfaces and can be synchronized with each other.
An Easy to use Browser Based MarkDown Editor With Live Preview Panel
Browser Based, Cross Platform, Supporting all Operating Systems, Easy Application. No need to remember any markdown syntax anymore. Just Select Your Text and Click on any of the Buttons Above ( Except for some buttons ). See the Below Screenshot for Details.
Notes:
This editor has been tested fully on the Firefox Web Browser and is quite successful.