[msantos]

+1 for OpenProject.

For small (sub 20 users) their hosted plan comes up to approx EUR1400 (total) per year. And IMO that's definitely worth paying for, instead of going down the self-hosting path once you considered the costs of self-hosting it i.e. (maintainer's hourly rate * 2 * 12) + hardware hosting costs.

https://www.openproject.org/intro/