The best open source alternative to MSI Afterburner is Open Hardware Monitor. If that doesn't suit you, our users have ranked more than 25 alternatives to MSI Afterburner and 11 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to MSI Afterburner are Stats (Free, Open Source), MangoHUD (Free, Open Source), CoreCtrl (Free, Open Source) and GreenWithEnvy (Free, Open Source).
Stats is a application which allows you to monitor your macOS system. - CPU Usage - Memory Usage - Disk utilization - Sensors information (Temperature/Voltage/Power) - Battery level - Network usage - Fan Speed Control
CoreCtrl is a Free and Open Source GNU/Linux application that allows you to control with ease your computer hardware using application profiles. It aims to be flexible, comfortable and accessible to regular users.
Nvidia Inspector is a small and handy tool that displays hardware information for Nvidia-based graphic cards. Main features also include: hardware monitoring, Core/Shader/Memory clock tuning, Fan Speed adjustment, etc.
Open Capture and Analytics Tool. If you want to know how well a game is performing on your machine in real-time with low overhead. It supports all major APIs on Windows – Direct3D® 11, 12 and Vulkan® – and can show an in-game overlay.