Markdown Viewer - Markdown document viewer. Allows to visualize formatted markdown documents in browser.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Markdown Preview for (Neo)vim - Preview markdown on your modern browser with synchronized scrolling and flexible configuration.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Joplin - 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, tagged and modified either from the applications directly or from your own text editor.
iTerm2 - A terminal emulator for macOS that does amazing things.