In the list of plugins in .../pluginManager/available it is not possible to
find plugins which are old, deprecated or not not maintained anymore. You
have to click on the plugins and see if they may work. Example is the
Skype plugin.

There are multiple ways to make this easier for a user:

1. add an indicator (color for example) for the age of the last release
2. add an indicator for the increase or decrease of the number of installations
3. add a column for the last release date which will allow the user to sort by this column
4. add a filter like "only show plugins updated in the last 3/6/12 months"