Simple keylogger in Go/C for macOS
Note that root privileges are required to run a keylogger. You'll also need to enable by going to System Settings > Privacy & Security > Accessibility and enabling whichever terminal application you'll use to run this.
git clone https://github.com/brymck/macos-keylogger.git
cd macos-keylogger
go build
sudo ./macos-keylogger ~/corpus.txt