Ewido was not built by AVG. It was recently aquired.Ewido is very good with 'Trojan' detection and removal.The link i provided was for dealing with 'Spyware'.
IMO, the best 'free' spyware scanner now is 'Superantispyware'-
http://www.superantispyware.com/download.html
Real time protection is only offered however in the paid for version.