Autoconf offers the developer a robust set of M4 macros which expand into shell code to test the features of Unix-like systems and to adapt automatically their software package to these systems. The resulting shell scripts are self-contained and portable, freeing the user from needing to know anything about Autoconf or M4.

Autoconf Archive is a collection of over 450 new macros for Autoconf, greatly expanding the domain of its functionality. These macros have been contributed as free software by the community.

The `config.guess' script tries to guess a canonical system triple, and `config.sub' validates and canonicalizes. These are used as part of configuration in nearly all GNU packages (and many others).

UFA is a simple to use, lightweight framework which sits atop the hardware USB controller in specific AVR microcontroller models, and allows for the quick and easy creation of complex USB devices and hosts. This package contains the user-submitted projects and bootloaders for use with compatible microcontroller models, as well as the demos and the documentation.

simavr is a new AVR simulator for GNU/Linux or any platform that uses avr-gcc. It uses avr-gcc's own register definition to simplify creating new targets for supported AVR devices. The core was made to be small and compact, and hackable so allow quick prototyping of an AVR project. The AVR core is now stable for use with parts with <= 128KB flash, and with preliminary support for the bigger parts. The simulator loads ELF files directly, and there is even a way to specify simulation parameterps directly in the emulated code using an .elf section. You can also load multipart HEX files.

The LUFA HID loader program communicates with the LUFA HID bootloader to upload new firmware.

Microscheme, or (ms) for short, is a functional programming language for the Arduino, and for Atmel 8-bit AVR microcontrollers in general. Microscheme is a subset of Scheme, in the sense that every valid (ms) program is also a valid Scheme program (with the exception of Arduino hardware-specific primitives). The (ms) compiler performs function inlining, and features an aggressive tree-shaker, eliminating unused top-level definitions. Microscheme has a robust Foreign Function Interface (FFI) meaning that C code may be invoked directly from (ms) programs.

The Axoloti patcher offers a “patcher” environment similar to Pure Data for sketching digital audio algorithms. The patches run on a standalone powerful microcontroller board: Axoloti Core. This package provides the patcher application.

The Axoloti patcher offers a “patcher” environment similar to Pure Data for sketching digital audio algorithms. The patches run on a standalone powerful microcontroller board: Axoloti Core. This package provides the runtime.

Ksoloti is an environment for generating and processing digital audio. It can be a programmable virtual modular synthesizer, polysynth, drone box, sequencer, chord generator, multi effect, sample player, looper, granular sampler, MIDI generator/processor, CV or trigger generator, anything in between, and more.

The Ksoloti Core is a rework of the discontinued Axoloti Core board. In short, Ksoloti aims for maximum compatibility with the original Axoloti, but with some layout changes and added features.

This package provides the patcher application.

Ksoloti is an environment for generating and processing digital audio. It can be a programmable virtual modular synthesizer, polysynth, drone box, sequencer, chord generator, multi effect, sample player, looper, granular sampler, MIDI generator/processor, CV or trigger generator, anything in between, and more.

The Ksoloti Core is a rework of the discontinued Axoloti Core board. In short, Ksoloti aims for maximum compatibility with the original Axoloti, but with some layout changes and added features.

This package provides the runtime.

Rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago. The idea is to combine the best features of a mirror and an incremental backup. Rdiff-backup also preserves subdirectories, hard links, dev files, permissions, uid/gid ownership, modification times, extended attributes, acls, and resource forks. Also, rdiff-backup can operate in a bandwidth efficient manner over a pipe, like rsync. Thus you can use rdiff-backup and ssh to securely back a hard drive up to a remote location, and only the differences will be transmitted. Finally, rdiff-backup is easy to use and settings have sensible defaults.

Grsync is a simple graphical interface using GTK for the rsync command line program. It currently supports only a limited set of the most important rsync features, but can be used effectively for local directory synchronization.

wimlib is a C library and set of command-line utilities for creating, modifying, extracting, and mounting archives in the Windows Imaging Format (WIM files). It can capture and apply WIMs directly from and to NTFS volumes using ntfs-3g, preserving NTFS-specific attributes.

Libarchive provides a flexible interface for reading and writing archives in various formats such as tar and cpio. Libarchive also supports reading and writing archives compressed using various compression filters such as gzip and bzip2. The library is inherently stream-oriented; readers serially iterate through the archive, writers serially add things to the archive. In particular, note that there is currently no built-in support for random access nor for in-place modification. This package provides the bsdcat, bsdcpio and bsdtar commands.

borgmatic is simple, configuration-driven backup software for servers and workstations. Protect your files with client-side encryption. Backup your databases too. Monitor it all with integrated third-party services. borgmatic is powered by borg.

Vorta is a graphical backup client based on the Borg backup tool. It supports the use of remote backup repositories. It can perform scheduled backups, and has a graphical tool for browsing and extracting the Borg archives.

Duplicity backs up directories by producing encrypted tar-format volumes and uploading them to a remote or local file server. Because duplicity uses librsync, the incremental archives are space efficient and only record the parts of files that have changed since the last backup. Because duplicity uses GnuPG to encrypt and/or sign these archives, they will be safe from spying and/or modification by the server.

Hdup2 is a backup utility, its aim is to make backup really simple. The backup scheduling is done by means of a cron job. It supports an include/exclude mechanism, remote backups, encrypted backups and split backups (called chunks) to allow easy burning to CD/DVD.

With dirvish you can maintain a set of complete images of your file systems with unattended creation and expiration. A dirvish backup vault is like a time machine for your data.

Btar is a tar-compatible archiver which allows arbitrary compression and ciphering, redundancy, differential backup, indexed extraction, multicore compression, input and output serialisation, and tolerance to partial archive errors.

Borg is a deduplicating backup program. Optionally, it supports compression and authenticated encryption. The main goal of Borg is to provide an efficient and secure way to backup data. The data deduplication technique used makes Borg suitable for daily backups since only changes are stored. The authenticated encryption technique makes it suitable for storing backups on untrusted computers.

Libarchive provides a flexible interface for reading and writing archives in various formats such as tar and cpio. Libarchive also supports reading and writing archives compressed using various compression filters such as gzip and bzip2. The library is inherently stream-oriented; readers serially iterate through the archive, writers serially add things to the archive. In particular, note that there is currently no built-in support for random access nor for in-place modification. This package provides the bsdcat, bsdcpio and bsdtar commands.

Restic is a program that does backups right and was designed with the following principles in mind:

• Easy: Doing backups should be a frictionless process, otherwise you might be tempted to skip it. Restic should be easy to configure and use, so that, in the event of a data loss, you can just restore it. Likewise, restoring data should not be complicated.

• Fast: Backing up your data with restic should only be limited by your network or hard disk bandwidth so that you can backup your files every day. Nobody does backups if it takes too much time. Restoring backups should only transfer data that is needed for the files that are to be restored, so that this process is also fast.

• Verifiable: Much more important than backup is restore, so restic enables you to easily verify that all data can be restored.

• Secure: Restic uses cryptography to guarantee confidentiality and integrity of your data. The location the backup data is stored is assumed not to be a trusted environment (e.g. a shared space where others like system administrators are able to access your backups). Restic is built to secure your data against such attackers.

• Efficient: With the growth of data, additional snapshots should only take the storage of the actual increment. Even more, duplicate data should be de-duplicated before it is actually written to the storage back end to save precious backup space.