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LevelDB
LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.
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llvm-project
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
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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.
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simdjson
Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
I'm partial to how cleanly written https://github.com/google/leveldb is. It is a reasonable size to fully read & grok in not too long.
If you want something much larger, getting the gist of https://github.com/llvm/llvm-project could be useful. Not only is it cleanly written, but then you'll understand your compiler better!
For example, if you are interested in 2D software rendering, check out antigrain library (https://github.com/ghaerr/agg-2.6) - it uses a lot of templates and interesting patterns that maybe you want to get familiar with, and as a bonus it has nice features that you can understand after few days exploring of that codebase.
Additionally, if you like low level stuff, check out libfmt (https://github.com/fmtlib/fmt) - not a big project, not difficult to understand. Or something like simdjson (https://github.com/simdjson/simdjson).
Additionally, if you like low level stuff, check out libfmt (https://github.com/fmtlib/fmt) - not a big project, not difficult to understand. Or something like simdjson (https://github.com/simdjson/simdjson).