I have tried a few, but theres a lot of them, but i only consider free tools if they have a free plan for life!
- I used Freedcamp for project management. Entirely free, unlimited projects for an unlimited time. They also have a small business plan which includes invoices, CRM and other integrations. Categorisation is super useful and the dashboard home gives you an important overview of each subproject within the main project plus the people working on a particular project. Every subproject can have a task list, milestones, discussions, timesheets, files, calendar, etc.