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generational-arena
Discontinued A safe arena allocator that allows deletion without suffering from the ABA problem by using generational indices.
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InfluxDB
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Regarding ECS: yes, but in a deflationary sense. The game has entities, stored in something very similar to GenerationalArena, and it has "systems", which are just functions that operate on these entities. The components themselves are just fields of the Entity megastruct. Having an ECS in the narrow sense doesn't really make a lot of sense for this game, because a lot of its rules are dependent on each other, and there's very little chance to extract parallelism. Also, even the current largest levels have less than 10k entities, so simulation performance is not a bottleneck yet.