OpenShift lately started to deprecate cartridges and consumers are told not to present them to the users so that users wont use outdated cartridges and they may get removed at some point in the future.

In the current OpenShift Online you can see this by the "obsolete" property:

"obsolete": true

• full example for zend-5.6 which is superseeded by the newer zend-6.1 ("obsolete": true):
  curl -H "Accept: application/json; version=1.2" --user <USER>:<PASSWORD> https://openshift.redhat.com/broker/rest/cartridges

  {
              "activation_time": "2014-04-08T20:30:59Z",
              "automatic_updates": true,
              "creation_time": "2014-04-08T20:30:59Z",
              "description": "A PHP server by Zend for applications that require performance, reliability and security. Zend Server combined with Zend Studio offers code optimization, debugging, and code assist.",
              "display_name": "PHP 5.3 with Zend Server 5.6",
              "help_topics": {
                  "Developer Center": "https://www.openshift.com/developers"
              },
              "id": "53445c82e0b8cddcff00000d",
              "license": "Commercial",
              "license_url": "http://static.zend.com/topics/Zend-License-EULA-2010-09-2.pdf",
              "maintained_by": "redhat",
              "name": "zend-5.6",
              "obsolete": true,
              "supported_scales_from": 1,
              "supported_scales_to": 1,
              "tags": [
                  "service",
                  "php",
                  "web_framework"
              ],
              "type": "standalone",
              "usage_rates": [
  
              ],
              "version": "5.6",
              "website": "http://www.zend.com"
          }
  

• full example for zend-6.1 which is superseeding zend-5.6 (no obsolete property)
  curl -H "Accept: application/json; version=1.2" --user <USER>:<PASSWORD> https://openshift.redhat.com/broker/rest/cartridges

   {
              "activation_time": "2014-04-08T20:30:59Z",
              "automatic_updates": true,
              "creation_time": "2014-04-08T20:30:59Z",
              "description": "A PHP server by Zend for applications that require performance, reliability and security. Zend Server combined with Zend Studio offers code optimization, deb
  ugging, and code assist.",
              "display_name": "PHP 5.4 with Zend Server 6.1",
              "help_topics": {
                  "Developer Center": "https://www.openshift.com/developers"
              },
              "id": "53445c82e0b8cddcff00000c",
              "license": "Commercial",
              "license_url": "http://static.zend.com/topics/Zend-License-EULA-2010-09-2.pdf",
              "maintained_by": "redhat",
              "name": "zend-6.1",
              "supported_scales_from": 1,
              "supported_scales_to": 1,
              "tags": [
                  "service",
                  "php",
                  "web_framework"
              ],
              "type": "standalone",
              "usage_rates": [
  
              ],
              "version": "6.1",
              "website": "http://www.zend.com"
          }