ARPAY - Buy gift cards at ar-pay.com, which allow you to access your favorite internet services: online games, e-wallets and console games, online shopping cards and many more!
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
G2A - Enjoy the vast offer of Steam, Origin, Uplay, Battle.net, GOG, PSN and XBOX CD-Keys at the most attractive prices on the market. Don’t overpay – buy cheap on G2A.COM!
7todos - A task board for indie hackers
Kinguin - Marketplace to buy/sell game keys for a myriad of platforms including: Battle.
TaskPaper - Plain text to-do lists for Mac