For freelancers to manage project and contacts, I would really advise this amazing product. This is a product that Fiverr is building just to support the Freelancer community, which is really great to see. The team is super supportive and want to improve your experience - which is amazing for a free product! If you do not require a huge solution such as Hubspot, this could really do what you are looking for in a simple and straight-forward manner.
Curious to see what you think!