Which additional Anti-Spam filters are provided in Exchange Anti-Spam Toolkit?

The additional anti-spam filters provided by QSS Exchange Anti-Spam Toolkit are the URL Filter Agent and Sender Score Agent.

Transport Agent	QSS Exchange Anti-Spam Toolkit Page	Description	Supported Exchange Roles
QSS Sender Score Agent	Sender Score	Scoring of messages using an IP-based DNS scoring service (such as Return Path Sender Score) Blocking of messages which based on a minimum sender score	Mailbox & Edge Transport
QSS URL Blocklist Agent	URL Filter	Blocking of messages based on a Domain-based DNSBL service	Mailbox & Edge Transport

As with the built-in anti-spam filters, you can choose to enable or disable each of the additional anti-spam filters independently.