MartechGuru - Keep track of your marketing technology SaaS contracts easily. No more spreadsheets.

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.

CabinetM - Pinterest for marketing tools: find, compare and build stack

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

The Angel Philosopher - A compilation of Naval's wisdom, knowledge and thoughts.

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.