At work we are required to have EDR software by our accounting firm (accounts inserting themselves into IT is annoying). We were running Kaspersky as well until

At work we are required to have EDR software by our accounting firm (accounts inserting themselves into IT is annoying). We were running Kaspersky as well until this happened though we were already unhappy with it so no loss. Anyway it made me think: is there a way to roll your own EDR for Windows/Linux/BSD? Basically, can we do EDR without the EDR software?