HostBill 3.8.0 has just been released, make sure to check what’s new:

OnApp & OnApp CDN: Pre-Paid Metered billing
Let your customers pay upfront for resources. Invoices can be generated after account credit will reach your threshold.

New module: Observium
Now you can add bandwidth billing through Observium, an alternative to previously released Cacti integration. Allow clients to browse graphs, estimate & bill for overages. Learn more at https://hostbillapp.com/products-services/observium/

New, Easy Development Kit
Building module for HostBill has never been easier – no object oriented programming skills required – simple function calls, well documented at http://dev.hostbillapp.com/procedural-dev-kit/ allows you to create fully functional module with a few lines of code.

2 new orderpages
– Gauge sliders – innovative orderpage, ideal for cloud & VPS hosters.
– Dedicated servers – full screen. Perfect for dedicated servers & colocation products.

Full changelog: http://hostbillapp.com/changelog/