This is go CLI tool for send fast Multiple get HTTP request.
you can use this tool for findings xss and sql injection vulnerablity from multi URL.
go get -u github.com/takshal/freq
or in latest version of go you can use below command
go install github.com/takshal/freq@latest
Using qsreplace you can add your xss payload in every perementer then you can use this tool to find vulnerablity.