libnetfilter_cttimeout is the userspace library that provides the programming interface to the fine-grain connection tracking timeout infrastructure. With this library, you can create, update and delete timeout policies that can be attached to traffic flows. This library is used by conntrack-tools.

The Embedded Linux* Library (ELL) provides core, low-level functionality for system daemons. It typically has no dependencies other than the Linux kernel, C standard library, and libdl (for dynamic linking). While ELL is designed to be efficient and compact enough for use on embedded Linux platforms, it is not limited to resource-constrained systems.

This is the io_uring library, liburing. liburing provides helpers to setup and teardown io_uring instances, and also a simplified interface for applications that don't need (or want) to deal with the full kernel side implementation.

This library enables userspace to use Linux kernel asynchronous I/O system calls, important for the performance of databases and other advanced applications.

Singularity is a container platform supporting a number of container image formats. It can build SquashFS container images or import existing Docker images. Singularity requires kernel support for container isolation or root privileges.

GNU Linux-Libre is a free (as in freedom) variant of the Linux kernel. It has been modified to remove all non-free binary blobs.

The SBC is a digital audio encoder and decoder used to transfer data to Bluetooth audio output devices like headphones or loudspeakers.

bpftrace is a high-level tracing language for Linux enhanced Berkeley Packet Filter (eBPF) available in recent Linux kernels (4.x). bpftrace uses LLVM as a backend to compile scripts to BPF-bytecode and makes use of BCC for interacting with the Linux BPF system, as well as existing Linux tracing capabilities: kernel dynamic tracing (kprobes), user-level dynamic tracing (uprobes), and tracepoints. The bpftrace language is inspired by awk and C, and predecessor tracers such as DTrace and SystemTap. bpftrace was created by Alastair Robertson.

This package provides a C library with C++ bindings and command-line tools for interacting with GPIO devices that avoids the usage of older system-wide /sys interface.

archivemount is a FUSE-based file system for Unix variants, including Linux. Its purpose is to mount archives (i.e. tar, tar.gz, etc.) to a mount point where it can be read from or written to as with any other file system. This makes accessing the contents of the archive, which may be compressed, transparent to other programs, without decompressing them.

This package contains Advanced Linux Sound Architecture Use Case Manager configuration of audio input/output names and routing for specific audio hardware.

Libmnl is a minimalistic user-space library oriented to Netlink developers. There are a lot of common tasks in parsing, validating, constructing of both the Netlink header and TLVs that are repetitive and easy to get wrong. This library aims to provide simple helpers that allows you to re-use code and to avoid re-inventing the wheel.

TLP is a power management tool for Linux. It comes with a default configuration already optimized for battery life. Nevertheless, TLP is customizable to fulfil system requirements. TLP settings are applied every time the power supply source is changed.

This package provides a way to record and replay device descriptions and events, making it possible to emulate input devices through the Linux kernel's input system. Emulated devices are for most practical purposes indistinguishable from real devices.

It provides a command line program and also a Python library.

The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux-based operating system.

This package provides userspace helpers for memory error detection and correction (EDAC).

cpupower is a set of user-space tools that use the cpufreq feature of the Linux kernel to retrieve and control processor features related to power saving, such as frequency and voltage scaling.

GNU Linux-Libre is a free (as in freedom) variant of the Linux kernel. It has been modified to remove all non-free binary blobs.

nftables is the project that aims to replace the existing ip,ip6,arp,ebtables framework. Basically, this project provides a new packet filtering framework, a new userspace utility and also a compatibility layer for ip,ip6tables. nftables is built upon the building blocks of the Netfilter infrastructure such as the existing hooks, the connection tracking system, the userspace queueing component and the logging subsystem.

The i2c-tools package contains a heterogeneous set of I2C tools for Linux: a bus probing tool, a chip dumper, register-level SMBus access helpers, EEPROM decoding scripts, EEPROM programming tools, and a python module for SMBus access.

This package provides a FUSE-based file system that provides read and write access to exFAT devices.

libnetfilter_cthelper is a userspace library that provides a programming interface to user-space connection tracking helpers.

1. register new user-space connection tracking helpers

2. unregister user-space connection tracking helpers

3. list existing registered user-space connection tracking helpers

Monitor a hardware random number generator, and supply entropy from that to the system kernel's /dev/random machinery.

As a consequence of its monolithic design, file system code for Linux normally goes into the kernel itself---which is not only a robustness issue, but also an impediment to system extensibility. FUSE, for "file systems in user space", is a kernel module and user-space library that tries to address part of this problem by allowing users to run file system implementations as user-space processes.