Orangescrum

Orangescrum has cloud, cloud self-hosted and Open Source Enterprise editions with multiple features.
In the cloud edition there are so many advantages like no installation required, integrate with your favorite apps, scalability and regular upgrades, unlimited projects and tasks, 24X7 online help (helpdesk, forums, and videos), mobile enabled project management (iOS and Android)

The Cloud and Self-Hosted editions are alike in their feature offerings and allow from 10 to unlimited users, projects & tasks.

The Open Source base code is completely Free for download and customizable as per users requirement.

Here is a quick Orangescrum feature snapshot -

Easy Project Planning and Assigning. Assign, schedule, collaborate and track tasks
End-to-End Task Management and Automated time tracking for your team
Resource Management and check your Resource allocation, availability and utilization
Automated Time Tracking and Schedule and create task dependencies
Create your own workflow as per your business requirement
Create, save and send accurate invoices to your customer/client.
Information rich Kanban view for TO DO, In Progress and Pending tasks
Get instant email notifications and reply on the go
Get daily team update right in your inbox with Daily Catch-Up
Easy to collaborate and brainstorm ideas, seek reviews & approvals instantly with the in-app chat
Here are the functionality details of Orangescrum below,

Task Management - Plan | Assign | Manage | Track
Time Tracking- Automated | Simplified | Accurate | Efficient
Resource Management - Know availability | Plan well | Deliver more | Utilize right
Custom Task Status - Define Flow | Improve Process | Automate
Custom Fields- Simplify | Prioritize | Organize | Variations
Budget and Cost Management - Budgeting | Spending | Billing Rate | Reports
Kanban View - Todo List | Collaborate | Track Statuses | Communicate
Timesheet - Timer | Daily Time Sheet | Billable & Non-billable | Save Time
Project Calendar - Plan | Estimate | Track | Share
Bug and Issue Tracking - Detect | Prioritize | Assign | Track
Workload Management - Capacity Planning | See Availability | Resource Allocation
Project Templates - Customizable | Easier | Eliminate Error
Gantt Chart - Manage Task | Manage Dependencies | Visualize Tasks | Get Clarity
Integrations - Improves Agility | Automates Processes | Improves Scalability
User Role management - Control | Protect | Enable permissions
Report and Analytics - Get Reports | Track | Measure | Improve Profitability
Mobile Application - Quick Connect | Collaborate Easy | Contribute More
Invoice and Billing - Accurate | Dependable | Actionable | Efficient
Orangescrum offers different pricing plans based on the users requirements. Normally it's free for all and $9 for 10 users on a monthly basis. Orangescrum comes with 15 days of free trial without credit card information.

Project Management Software