A free utility that finds malware, adware and other security threats
Just to add to this, not a real time AV, but may still be of interest - dragokas/hijackthis
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
Use of freeware / open-source security tools
1 project | reddit.com/r/antivirus | 17 Dec 2021
Combofix alternative on Windows 10
2 projects | reddit.com/r/Windows10 | 10 Dec 2021
Great aunt's laptop is riddled with browser hijackers.
1 project | reddit.com/r/techsupport | 28 Oct 2021
Something on my PC is causing me to get banned from every BattleEye game and Easy Anti-Cheat Game
1 project | reddit.com/r/techsupport | 9 Jun 2021
[java]“Username or password is incorrect”
1 project | reddit.com/r/MinecraftHelp | 31 Jan 2021