There are 3 repositories under userspace topic.
Userspace eBPF runtime for fast Uprobe & Syscall hook & Extensions with LLVM JIT
ksmbd kernel server userspace utilities
demos-linux is a project to demo and explore the Linux user space C/C++ API
Moved to https://github.com/Azathothas/Toolpacks
Sending IP packets as fast as possible in userland.
An advanced driver for Razer Chroma hardware in Linux
Developing software framework for the GO programming language
A basic file system in user space written in C using FUSE
A x86_64 hobby OS
the kool useful system helper – a from-scratch hobby OS written in C++20
AF_XDP Test Environment - Running Inside Docker Network
Linux userland rootkit. Hides file and directory, hides process, hides bind shell port, hides daemon port, hides reverse shell port, cleans up bash history and logs during installation
systemtap script for analysis kernel, userspace
Layer 2 tunneling over layer 4 protocols
Easy way to expose process internal state to filesystem using fuse.
School of Informatics (University of Edinburgh) Research Operating System User-space
Userspace implementation of preemptive multithreading
A Wireguard VPN install & configuration Ansible role with Boringtun userspace implementation.
Lock-free RCU (Read-Copy-Update) user-space library
Preventing unauthorized invocation of open system call in Linux by running processes in sand-boxed environments using capability based authorization implemented in user space.