Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Hours - Boosting productivity through live, virtual co-working.
Timewise - Instant calendar analytics for busy managers
Futuramo Time Tracker - Futuramo Time Tracker is a time tracking solutions designed for freelancers and teams.
TIJD - Register your time effortlessly
Freelancer Stack - Curated directory of tools used by 10,000+ freelancers