Microsoft To-Do - Task management tool
Makerlog - Makerlog is the dead-simple task log that helps you stay productive and ship faster.
Gone - An ephemeral to-do list
WIP.co - Work in progress. We are a community of makers who help each other ship product.
KosmoTime - The to do list with super powers
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.