[jasondoty]

Definitely IDA Pro.

It is an interesting case in piracy, as being the go-to software for reverse engineers, it also has the biggest target on its back for software crackers. Despite this, newer versions are not always cracked and released publicly so quickly. It seems each license owner gets their own custom watermarked build of the software. The crack of version 7.7 was leaked from Think-Cell, the excel add-ons company. 8.3 was recently seen released, with an anonymous supplier and Vietnamese cracking group behind it.

[kuroguro]

The funny thing is IDA added an x64 decompiler for the free version right after the post. The piracy could have been avoided if it wasn't for the timing.