Free to download and use. Works with PCSX2 1.7.0 and newer.
Run PStooEZ-Setup.exe and follow the prompts. Windows may show a SmartScreen warning — click "More info" then "Run anyway".
In PCSX2, go to Settings → Advanced and enable "Enable DebugServer". Restart PCSX2.
Open PStooEZ. It auto-detects PCSX2 and the running game. Your cheats load automatically.
Toggle cheats, drag sliders, or open AI Hunt to find custom addresses. That's it.