Process Monitor - Real-time OS system call monitor - https://docs.microsoft.com/en-us/sysinternals/downloads/procmon
Process Explorer - Enhanced process manager - https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
Process Hacker - Enhanced process manager similar to Process Explorer, but open source - https://processhacker.sourceforge.io/
RegShot - System monitoring tool which will compare two snapshots on a system and show the differences - https://sourceforge.net/projects/regshot/
FakeNet-NG - Tool used to respond to and record all traffic attempting to leave a system. Used to trick malware into thinking they are online. - https://github.com/fireeye/flare-fakenet-ng/
InetSim - Perl scripts used to respond to service requests, such as HTTP. - https://www.inetsim.org/
PAFish - Tool used to test a system using various VM and debugger detection techniques - https://github.com/a0rtega/pafish