Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
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.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Slack - A messaging app for teams who see through the Earth!