Merged into Gifsicle!

Lossy PNG compressor for RGBA PNGs. Has two modes: lossy averaging filter (blurizer) that denoises the image and optimal posterization using Median Cut quantization to reduce number of unique colors in the image with minimal visual distortion

Windows 64-bit jpegoptim builds

AAC encoder (different with FAAC, nero aac or qtaac), very good quality.

Utilities for lossy recompress JPEGs

Lossy wavelet video codec. Comparable to MPEG-4 Part 2 and Part 10 (H.264) in terms of efficiency and quality.

Efficient lossy compression algorithm for floating point data

Lossy PNG compressor for RGBA PNGs. Has two modes: lossy averaging filter (blurizer) that denoises the image and optimal posterization using Median Cut quantization to reduce number of unique colors in the image with minimal visual distortion

JPEG DCT coefficients access in C. Quant JPEG DCT coefficients.

Lossy compression of PNG images

A sample implementation of IMA-ADPCM wav encoder / decoder.

Opensource implementation of both encoder and decoder of the ITU G729 Annex A/B speech codec.

Data compression cli program

Playing with lossy image compression based on the singular value decomposition

Lossy PNG compressor for RGBA PNGs. Has two modes: lossy averaging filter (blurizer) that denoises the image and optimal posterization using Median Cut quantization to reduce number of unique colors in the image with minimal visual distortion

Ultra-low-complexity MDCT Audio Codec

Open Source implementation of Audio Processing Technology codec (aptX)

[Experimental] INu (dog in japanese) Audio Codec (INAC) is a lossy audio codec using Sign-Sign LMS filters.

Lossy PNG compression with adaptive quantization

TiLib (Tiny Library) is a wavelet-based lossy image compression library.