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python-tcod-ec
Entity/Component containers for implementing composition over inheritance. Works well with type hinting.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For my own project I've been skipping the entity repository and systems and implementing only entity/component frameworks for practice and since I might not need systems most of the time (although there are big downsides for entities and components not being in a repository). My own project can be found here.
This is the ECS FAQ I'm currently using.
If you don't mind the broken type hinting then you could go with Esper.
NOTE:
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Hence, a higher number means a more popular project.