If you find Ionic's ISAPI Rewrite Filter (IIRF) to be useful, I'd encourage you to donate.
This is called DonationWare:
Software that is free to use, but the author encourages donations from satisfied users.
I'll give all donations to the Boys and Girls Club of King County, in Washington, USA.
I am accepting donations via Paypal. Any amount is appreciated.
Thanks for your support.