Ask HN: Good Project Management for Content Writers

Hey HN. We are a little team of 4 friends and we have a small content writing agency, where we write content for our clients. Till now we used skype + google drive to coordinate the work but with a few new clients it became too hard.

This is why I am looking for a small and simple project management tool, where our clients can set content title,keyword and description and we fulfill the project. Nothing too overcomplicated. I don't mind whether it is self-hosted or SAAS, as long it does its job :)