uCMDB is one of best discovery software available in the market. It can discover almost everything and creates relationship among discovered CIs and create a topology modelling. You can setup uCMDB server with multiple probes and it can be distributed across all regions to collect information locally and ship to central node. Its scale-able. It discovers various pieces from hardware, software, custom application and tie them together to create a map using ASM (Automated Service Modelling). It works agent less and with agent solutions. Review collected by and hosted on G2.com.
Most of the features are very good so hard to say what I don't like. Review collected by and hosted on G2.com.