Sohu Kan is a 'Read it later' service with a set of apps to collect and read articles by leveraging fragment time.
A missing Python Enum/Option lib supports enum code, name, text, even (code, name) tuple list and so on.
A WeChat mini-programs game to guess numbers in my mind.
A convenience tool to automatically send/receive message to/from MQ such as RabbitMQ, Kafka and etc.
A lib to connect differnt Message Queues via an abstacted way.