VivifyScrum is a project management tool which started off as a Scrum and Kanban collaboration tool. Over the years, it has grown into a full-fledged PM tool with a number of advanced features available, such as team management with worklogs, an in-built time tracker and invoicing options and more. It features integrations with GitHub, GitLab, BitBucket, Slack and it allows for webhook integrations with other apps. VivifyScrum has a very generous free plan, as well as reasonably-priced Premium Plan. Educational and non-profit organizations should inquire about a discount. Enterprise, self-hosted version is also available.

Intervals is customizable time tracking and task management software built for the unique needs of small teams. Includes everything you need to take a project from inception to completion with powerful productivity reporting. Includes project budgets, a work request queue, Gantt charts, invoicing, a mobile app and more.

Ideal for consultants, web developers, creative agencies, IT services firms, and communications companies. Especially if you bill for your time. Flexible usage based pricing tiers that don't charge per person.