libfaketime modifies the system time for a single application

List of resources related to LD_PRELOAD, a mechanism for changing application behavior at run-time

Inject a shared library (i.e. arbitrary code) into a live linux process, without ptrace

Turn IP sockets into Unix domain sockets

A simple LD_PRELOAD library to disable SSL certificate verification. Inspired by libeatmydata.

LD_PRELOAD rootkit

Hackbrary to Hook and Augment X11 protocol calls

Memstop monitors available memory and waits until a configurable percentage of memory becomes available before allowing a program to start.

LD_PRELOAD library to bypass TLS certificate verification for debugging and testing

Universal extension framework for Linux applications

My Kobo mods/hacks/tools which aren't patches and aren't in koboutils.

A library for creating mods for Kobo's eReader software, Nickel.

Open-source firewall for AI agents. Policy engine that audits and controls what OpenClaw, Claude Code, Cursor, Codex, and any AI tool can do on your machine.

Make programs think their stdout is a tty / terminal.

Override time reporting in Linux processes (accelerate/slowdown games, test code involving timers/delays)

Support fonts with double-width icons in xterm/rxvt-unicode/zsh/vim/…

Proxy protocol v1 and v2 support via an LD_PRELOAD library

ld_preload userland rootkit

A simple Linux in-memory .so loader

Show stack traces from C++ exceptions at run-time without rebuilding target applications