This is 2 Project Management Software that i found when i searching about this issue. Seems like not many people know about that website. I believe many people interested with this project management software stuff.
1. Autotask – Project Management Software: #1 Web Based IT business management software for VARs, MSPs, Systems Integrators, IT Service Providers, IT Consultants & ISV’s. PSA Software. Project Management, CRM & Help Desk with timesheets, billing, real-time reporting, built-in integration platform. Autotask Official Website

2. Simply Project Office – Project Management Software: The Project Management software that should be commonplace in every Programme and Project Office. It is a practical, powerful, software tool-set that addresses those tiresome tasks that must be managed for effective and successful Project Management.
Ps: Its really different and i wonder how this project works and which one is better. Autotask or Simply Project Office?
What is actiTIME? actiTIME is web based time tracking software available as freeware and shareware. It provides time-expenses collection and reporting for billing and other purposes. Customization service available. They vendor is Actimind, Inc. and we can categorize them under freeware and Open Source, Web-based.

actiTIME proves that timesheet / time-tracking software is a simple low-price office application, which is meant to be cost-efficient and money saving tool. actiTIME timesheet is free for small teams (10 people or smaller).
How to start?
It’s really easy. You just need a few minutes to getactiTIME timesheet running for you. All time-tracking, management and reporting interfaces are clear and intuitive — it will take no time to learn. You and your team-mates will get a positive user experience working with a simple and efficient time-tracking software. I guess its not too hard, right?
Ps: You can download their small version if you like : actiTIME download