Top free AV products
BitDefender Free, ZoneAlarm Free, Adaware Free AV, Commodo Free, Avast, Avira, AVG
Kaspersky, eSET, and BitDefender as the top paid AV products.
Malwarebytes Free version is something everyone should have as an on-demand/backup scanner. It doesn't have a real-time component, you have to get the paid version for that, so it can't be your primary, but nothing beats it as a secondary.
Adaware by Lavasoft, Spybot Search and Destroy, Superantispyware, Malwarebytes all offer free and paid options. Other top products: Spyware Doctor, Double Anti-Spy Pro, Avast Grimefighter, Vipre Antispyware (formerly Sunbelt's CounterSpy), Bullguard
It used to be that antispyware were standalone products to run along side of AV software, but most AV software has added fairly good antispyware to their products. Likewise, many of the antispyware products have had full AV programs added to them (Adaware is a good example of this).