Chestnut Package Manager is a utility to handle executables and resource files in a transparent, platform independent, and relocatable way. Its concept is similar to Apple bundles and Java archives. It is implemented in Python. Chestnut makes it possible to invoke programs or obtain resources without knowledge of their absolute or relative path, making them accessible even after relocation of the package to another directory.
Nix is a purely functional package manager. It allows multiple versions of a package to be installed side-by-side, ensures that dependency specifications are complete, supports atomic upgrades and rollbacks, allows non-root users to install software, and has many other features. It is the basis of the NixOS Linux distribution, but it can be used equally well under other Unix systems.
MT-write is a binary patch for multi-threaded writing. It comes in the form of a shared object that can be preloaded to programs like tar to make their write operations multi-threaded. Multi-threaded writing can improve performance on RAM based filesystems and highly scalable filesystems with multiple spindles.
grzip is a high-performance file compressor based on Burrows-Wheeler Transform, Schindler Transform, Move-To-Front, and Weighted Frequency Counting. It uses the Block-Sorting Lossless Data Compression Algorithm, which has received considerable attention in recent years for both its simplicity and effectiveness. This implementation has a compression rate of 2.234 bps on the Calgary Corpus (14 files) without preprocessing filters. This is essentially an adaptation/extension of GRZipII by Ilya Grebnov.
rootpretender is a system that enables special file operations such as the creation of block special and character special device nodes and unlimited chown()ing of files for non-root users of Unix systems. It does this by faking special file operations. For example, chown() is not executed, and mknod() creates regular files instead of device nodes. These operations are remembered, so next time a process under rootpretender's control examines an affected file with stat() or a similar system call, the fake information is returned. It uses LD_PRELOAD and includes patches for rsync 2.6.6 and rsync 2.6.9 for use on systems without LD_PRELOAD support. These make it possible to copy file ownership and device nodes even if root access is not available on the target.
PeaZip is a cross-platform file archiver utility that provides a unified portable GUI for many open source technologies like 7-Zip, FreeArc, PAQ, UPX, etc. Creates 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, and ZIP files. It extracts more than 150 archive types: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX, and more. Features of PeaZip include extracting, creating, and converting multiple archives at once, creating self-extracting archives, split/join files, strong encryption with two factor authentication, an encrypted password manager, secure deletion, find duplicate files, calculate hashes, and export job definitions as scripts.