We use Asana (which is great) for handling projects, setting up tasks. Essentially all of the daily work. Asana is integrated with Toggl (also great) to track time on the tasks set up in Asana. Time tracked in Toggl is then synced automatically with LiquidPlanner. (which is great as far as features go but using it, not so much) That allows us to tell when our resources will free up, lets us plan future projects and we can give customers a direct estimate of when we can deliver.