Best Support System is self-hosted support ticket application.It handle support ticket, manage email ticket, collect any payment by paypal. It has easy installer so you don’t need any programming skill. We will keep update reqularly and it has auto update feature.
Elite Licenser is a WordPress plugin for any types of product licensing. It also manages product updates, auto generates license code, built in Envato licensing verification system, full license control and more. It has full set of API, so you can handle it by other applications as well.You can handle any language (PHP, .Net, Java, Android, etc.).