First of all I don't know if it this question belongs here if not please tell me.

I've recently evolved from freelancer to a small .net/php development shop and we're trying to figure out what the best tools for team development will be (code repository, continuos integration server, automated testing, etc.).

Do you have some recommendations, preferible open source or low cost since we are starting out. (We already have visual studio for all the team members).

Thanks