The SCCM Software Center is where users can install software from a portal at their convenience. It is available from the Start Menu under Microsoft System Center > Configuration Manager > Software Center. It will look the following when opened:
The software listed will include any applications you have to set to "Available" status.
For information on creating application packages, visit the Application Creation page. Printers and software that not everyone needs to install are ideal for the Software Center, single-use licenses may not be a good idea.