EXPERTool is described as '™ tuning utility for customized performance enhancements and efficient desktop management' and is an app in the Photos & Graphics category. There are more than 10 alternatives to EXPERTool for Windows, Linux, Mono and Mac. The best alternative is Open Hardware Monitor, which is both free and Open Source. Other great apps like EXPERTool are MSI Afterburner (Free), RivaTuner (Free), CoreCtrl (Free, Open Source) and ASUS GPU Tweak III (Free).
A powerful overclocking tool for your graphics card, which also includes screen capture and video capture tools, plus overlays. Has a lower FPS hit than Fraps, and offers the same functionality. The beta versions include audio streams alongside the video capture.
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.
ASUS GPU Tweak III is currently open beta testing so try it out, if you feel it is missing something crucial give ASUS your feedback & they may be able to add it while still in beta. So far ASUS has been very accommodating with all useful feedback.
EVGA Precision X1 allows you to fine tune your EVGA graphics card for the maximum performance possible, with Core/Shader/Memory clock tuning, real time monitoring support including in-game and compatibility with almost all EVGA graphics cards.
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.
This tool is developed by Ray Adams. ATI Tray Tools is a Full Featured Radeon Tweaker that can be found in the windows tray which then allows instant access to options and settings. Quite handy and quite a small download. Just click the executable and you are good to go.