Is there a best practices analyzer for EXchange 2013? I seem to have found conflicting answers online.

Are there any other useful tools or scripts which can be used for a risk assessment/health check of an internal exchange 2013 environment to identify any health issues or bad designs/configurations?

Does not. You have to use/download 365 BPA tool:

The Office 365 Best Practices Analyzer for Exchange Server 2013 can be used for organizations with:

• Exchange Server 2013 on-premises only
• Exchange Server 2013 hybrid configuration

Presume this means you cant run it from a desktop PC, only a Server? (i.e. the OS pre-requirements indicate Server 2008 R2 onwards).