VOGSY - Professional service automation tool built on Google G Suite
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Office Timesheets - Professional Services Automation
Redmine - Flexible project management web application
HarmonyPSA - HarmonyPSA - Professional Services Automation (PSA) for IT Businesses
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.