AWS Amplify Admin UI - Firebase from AWS, but much better

EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

Lemon - Buy now, pay later for SaaS

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

C Compiler - C Compiler is an artificial intelligence-based application that allows compiling codes and programs writing with syntax recognition, auto-formatting, and many awesome options like keywords, history progress, introductory content, decision making, lo…

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.