PracticePanther - PracticePanther offers CRM, invoicing, time tracking and communication solutions for law firms.
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.
iDempiere - iDempiere Business Suite ERP/CRM/SCM done the community way.
Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.
PHC FX - PHC FX is a comprehensive solution that offers a wide range of functionality at any price.
Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.