Binary versions of PAExec are available at:
http://www.poweradmin.com/paexec/
PAExec is a free, redistributable and open source equivalent to Microsoft's popular PsExec application:
http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx
The main PAExec page shows all of the command line options.
http://www.poweradmin.com/paexec/
Basically anyone can use the software for private, public or commercial uses, including using it as part of a distributed commercial application. No payment or attribution is required.
The legalese that says the same thing: http://www.poweradmin.com/paexec/paexec_eula.txt