You mean something apart from the standard ASDM GUI already included? It can monitor the individual device logs and the monitor can be filtered to show a subset of messages including attacks.
The Cisco Security Manager (CSM) product is good at collating multiple security devices' logs into a single Event Viewer.
You can also use any 3rd party syslog server tools for basic log capturing and analysis. Examples include Solarwinds' products (Log and Event Manager, NPM and Kiwi Cattools depending on whether you want fancy or basic). Most of the 3rd part products also include other functions.
