A great and very comprehensive tool, which allows you to do almost everything to manage you software development company. From managing a project's portfolio, predicting the future to tracking people's work and managing your finances.
SlimPlanner - Team scheduling, resource planning, task management
Hub Planner - Transparent Resource Scheduling, Timesheets, Vacation, Resource Requesting, Project Management & powerful Reports in an agile designed, feasible & intuitive software for simple planning
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
10000ft - 10,000ft's high-level project management software helps teams get the clarity and insight they need to look ahead, avoid pitfalls, and plan for growth.
WorkPatterns - The modern manager's toolkit: 1:1s, feedback, & recognition
ResourceGuru - The fast, simple way to schedule people, equipment, and other resources online.