Open source billing and support software
A client of mine wanted to use WHMCS but it doesn't quite do what he needs and since it's closed source I can't do squat about it, so does anyone know any open source software that can handle invoicing, billing, user accounts etc and support tickets.
They could be separate bits of software one for billing one for support.
And they need to be written in PHP preferably with a MySQL or SQLite back end.
For both in one package, I must admit I've only heard of WHMCS.