lzop compresses files through the LZO library, ships under the GPL, and puts speed ahead of ratio on both sides of the job. Version 1.04 defaults to level 3 and keeps the source file, which suits backup archives.

BZip3 compresses text and source code without loss, pushes the block ceiling from 1 MiB up to 511 MiB, adds a Lempel-Ziv predictor ahead of the transform, swaps in context mixing for entropy coding, and ships six command line tools.

XZ Utils is free general purpose data compression software built on LZMA2, producing the .xz format that source packages and firmware images so often use, with a liblzma library other programs can call directly.

NanaZip keeps everything that made 7-Zip reliable and replaces only the shell: a Fluent interface that follows the system dark mode, a context menu that belongs in Windows 11, modern icons and dialogs. The engine is merged forward from upstream, and the project ships under a permissive licence.

FreeArc is the archiver Bulat Ziganshin built around one obsession: pick the algorithm per file type, then stack every trick available. Text goes to PPMd, executables get BCJ preprocessing, solid blocks and recovery records protect the result, and AES, Twofish and Serpent can be chained. Frozen at 0.67, still unmatched as a study in compression design.

PAQ8px is a research compressor from the PAQ family that mixes dozens of prediction models to push lossless output towards the entropy limit, at the cost of time and memory.

LZ4 is an open-source lossless compression library built for paths where data cannot wait: more than 500 MB/s of compression per core, decompression in the gigabytes per second per core, which usually hits memory bandwidth as the ceiling. Ratio is traded away for latency low enough to sit inside real-time traffic, and version 1.10.0 turns multithreading into a supported feature.

Official builds for Windows, macOS, Linux and Android plus a web version, no ads and no account: packs open to b1 or zip, and nearly forty formats unpack, including split and password-protected archives.

Snappy does not chase the smallest output, it chases speed: better than 250MB a second compressing and more than 500MB a second decompressing on a single ordinary core, at the cost of output twenty percent to twice the size. That trade is why it sits underneath databases, large data systems and log pipelines.

GNU tar packs files and directories into one archive while keeping structure, permissions and timestamps, and leaves compression to gzip, xz or zstd.