There are 2 repositories under undervolt topic.
Unlock the full potential of your Intel/AMD based device.
Script to test single core stability, e.g. for PBO & Curve Optimizer on AMD Ryzen or overclocking/undervolting on Intel processors
Intel CPU undervolting and throttling configuration tool
Set P-State voltages and clock speeds on recent AMD CPUs on Linux.
Intel(R) Xeon(R) Processor Max Effort Turbo Boost UEFI DXE driver
Scripts for undervolting 6+th gen Intel i* CPUs and their internal GPU.
Thunderbolt Switch, a software that switches your game settings and device power profiles (TDP, Power Balance, Voltage) for all your games based on device current status (AC, DC, EGPU, External Screen). Now compatible with both Intel and AMD processors.
Scripts to manage various aspects of the AMD line of cards in Linux
Ansible playbook used for installation of essential development and general use software
Golang tool to modify Ryzen CPU p-state settings from Linux CLI
Firmware patch for unlocking FIVR control + Overclocking on Apple computers
A no-dependency utility to undervolt Intel CPUs on Linux systems, with user-friendly GUI
GTK based GUI for undervolting intel CPUs on linux
A lightweight tool designed to undervolt your Intel CPU and integrated GPU, helping to reduce power consumption, lower temperatures, and maintain performance levels.
A repository to allow users to automatically apply XTU profiles on boot with the use of Powershell.
Core Adjust is a software tool that can be used to adjust various settings of 4th generation (Haswell) and later Intel(tm) processors on Debian/GNU and other Linux systems.
Just an undervoloting, but, with infinite loop ;)
Counter Lenovo Thinkpad CPU throttling and stubborn/excessively conservative thermal management to boost laptop performance under Ubuntu
ArchLinux PKGBUILD for "intel-undervolt-git". As seen in AUR.