I warmly prefer SCCM but due to fact that PDQ is easier, cheaper and with less server resources requirements PDQ can be good a choice as alternative. (there is a free version too with less features)
Download:
http://www.adminarsenal.com/download-pdq
Here they are some feature about that:
PDQ Deploy is a software deployment tool that allows admins to silently install almost any application or patch.
Its features include:
- Integrates with Active Directory, Spiceworks, PDQ Inventory, and more
- Install to multiple computers simultaneously
- Real-time status
- Install just about anything
- Agentless
PDQ Inventory scans and reports software, hardware, and OS configurations for your Windows network.
Its features include:
- Scanning for installed software and hardware on each computer
- Create reports on what's installed on your network
- Organize computers into collections that make sense to you
- Really cool admin tools allow you to perform tasks on your computers
- Integration with PDQ Deploy
Here they are product comparisation.
PDQ Deploy Comparison
PDQ Deploy Free, Pro, and Enterprise Features
| Features | Free Mode | Pro Mode | Enterprise |
| Deploy Applications and Patches |  | | |
| Works with MSI, EXE, Batch, and more. | | | |
| Deploy PowerShell & VB Script | | | |
| Deploy to PDQ Inventory, Spiceworks, AD | | | |
| Basic level Package Library Access1 | | | |
| Schedule Deployments | | | |
| Create Multiple Step and Chained (Nested) Packages | | | |
| Integrate with Custom Tools & Scripts | | | |
| Set Automatic Inventory Scan After Deployments 2 | | | |
| Throttle Bandwidth | | | |
| Status Email After Deployments | | | |
| Wake-On-LAN & Heartbeat Schedule | | | |
| Setup Recurring Deployments | | | |
| Independent Schedules | | | |
| Multi-user capable (package sharing) | | ||
| Full access to Package Library (See list) | | ||
| Auto Deployment of Library Packages | | ||
| Retry Queue | |
related pdq and sccm articles:
Tips - how to migrate PDQ deploy and PDQ inventory to another server
Server - PDQ Deploy utility per monitorare la rete ed installare software