Detect installed applications (software dev) on OS X Lion
Apple Menu > About This Mac >

In the resulting window: (More Info)

In the side bar of the resulting window: Software > Applications

Columns presented:

Application Name | Version | Last Modified

Click on a row to see more details:


Kind (architecture)
64 Bit
App Store
Get Info String
Location (in the file system)


I see Python this way (3 different versions actually) but not PHP or Ruby.