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To find your app installation history in OS X, head to the System Information window (f.k.a. System Profiler). You can get there by clicking on the Apple icon in the Menu Bar, holding the Option key, and selecting System Information, or you can launch the System Information app located in Macintosh HD/Applications/Utilities/.
System Information provides a wealth of information about your Mac and operating system, including important details such as your Mac’s serial number and specific model identifier, memory type and configuration, attached USB and Thunderbolt devices, and the capabilities of your network interface. What we’re interested in, however, is Software.
In the list of categories on the left of the System Information window, find Installations under the Software section. This window displays a complete list of all software currently installed on your Mac, including any updates.
Qualquer software que não tenha sido fornecido com o Mac teria a "Origem" listada como "terceiros"
Espero que isso ajude!