nQuant is a C# color quantizer producing high quality 256 color 8 bit PNG images using an algorithm optimized for the highest quality possible. 

AVIF is a new image format derived from the keyframes of AV1 video. It's a royalty-free format, and it's already supported in Chrome 85 on desktop.  

AVIF offers significant file size reduction for images compared with JPEG or WebP; ~50% savings compared to JPEG, and ~20% savings compared to WebP.  

Compress local video for react native. Only for iOS, Android will be coming.

EasyCompressor is an open-source compression abstraction library that supports and implements many compression algorithms such as Zstd, LZMA, LZ4, Snappy, Brotli, GZip and Deflate. It is very useful for using along with Distributed Caching or storing files in database. 

Unraveling the JPEG 

Zstandard, or zstd as short version, is a fast lossless compression algorithm, targeting real-time compression, providing high compression ratios. It offers a very wide range of compression / speed trade-off and is deployed within Facebook

Tools for using Zstd :  7-Zip with support Zstd     -  Zstd plugin for 7-Zip

.Net Wrapper for Zstd :     ZstdNet   -  Zstandard.Net  

The IL Linker is a tool one can use to only ship the minimal possible IL code and metadata that a set of programs might require to run as opposed to the full libraries

7 ways to compress PDF files in C#, VB.NET