DomainIQ is from the same brilliant minds behind Estibot, FYI.
I don't know if DomainTools has any free services; I have a paid account since this tool is so useful for me. I wish they offered a less costly account level like they used to years ago.
The Domain Tools page has received another overhaul and is getting deeper integration into the board software, we keep adding to it with custom links to specific areas in the page.