Don't know if this is related to API or integration:
Froxlor.org is a well known hosting administration panel which could be "linked" over an API with WHMCS as cPanel or other WHM provide it already.
+1 for this feature request.
We need WHMCS for Froxlor!
If you like an alternative interface between Froxlor and WHMCS, just get in touch with me. Regards.
Update: there is an active development of this alternative interface which puts PHP files into your Froxlor installation and calls these over an HTTP(S) API from WHMCS module commands. Contact me for further information.
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