Top 3 C Lossless Projects

flac

17 1,516 8.1 C

Free Lossless Audio Codec

Project mention: Best iPod for music in 2023 with large capacity. | /r/ipod | 2023-05-28

The Xiph.org foundation maintains FLAC and they have a list of tools that might be helpful.

precomp-cpp

14 387 0.0 C

Precomp, C++ version - further compress already compressed files

Project mention: Does epub compress well? | /r/DataHoarder | 2023-05-04

You should look at Precomp - an apparently abandoned, but awesomely working arhiver that is dedicated to compressing those ZIP-based formats, and compresses them twice-thrice as small as LZMA2 can.

InfluxDB

www.influxdata.com sponsored

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.
qoir

3 94 0.7 C

A fast, simple, lossless image file format.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).