Pngle - PNG Loader for Embedding
MIT License
Lossy PNG compressor — pngquant command based on libimagequant library
GIF encoder written in C
A screenshot server, library, and command-line utility for the Raspberry Pi
Jaggies - a tiny vector graphics library
Simple, modern libpng alternative
LIBPNG: Portable Network Graphics support, official libpng repository
LodePNG Node.js bindings
A fast, simple, lossless image file format.