Nifty - Manage projects, work, and communications in one place.

MacDown - MacDown is an open source Markdown editor for OS X, released under the MIT License.

Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Frost - An open API for Blockchain timestamping

Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.

Typora - A minimal Markdown reading & writing app.