Avira: Avira offers both free and paid antivirus software. There are three paid antivirus subscriptions priced between $44.99 and $99.99 a year. In addition to being an antivirus product, Avira also offers a virtual private network (VPN), a password manager, ad blocking and other features. However, you don't get things like spam filtering, backup or other common features of other antivirus suites.