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libCat
🐈⬛ A runtime for C++26 w/out libC or POSIX. Smaller binaries, only arena allocators, SIMD, stronger type safety than STL, and value-based errors!
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EA Standard Template Library
EASTL stands for Electronic Arts Standard Template Library. It is an extensive and robust implementation that has an emphasis on high performance.
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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.
I am currently working on one STL alternative (https://github.com/Cons-Cat/libCat), although it is extremely different than the ones you mentioned. Those that you mentioned, even including EA STL (albeit to a lesser extent) are largely extensions of the same programming model as the STL, which itself is an extension of the programming model to libC or POSIX.
I recently read this benchmark series about hashing and hashmaps, which includes EA STL. It performs fairly decently overall in that regard. EA STL also has benchmarks in its source repo. But I would also expect that some of its perfomance improvements are almost self evident, such as containers like tuple_vector, intrusive containers, and fixed-size containers that don't have an analogous feature in the STL, all of which are integrated into its own polymorphic allocators and arenas (different from and more flexible than std::pmr) along with its other algorithms. It would be interesting to see them benchmarked against Boost, which has similar features but written in the STL style.