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I have a new tablet that I installed CM12.1 and Pico GApps on. Here is a picture of the app screen:
I'd like to understand where each app comes from (either AOSP, CM or GApps). Is this something I can deduce from the apps' location on the filesystem, or the apps themselves perhaps ?
I have tried to find the information on the relevant sites for AOSP, CM and OpenGApps but have so far drawn a blank.
EDIT: Gathered additional content from the comments.
CM will list the package name of the apps in Apps Info. Those with com.cyanogenmod, org.cyanogenmod, cyanogen and com.cyngn (thanks @Izzy !) are certainly Cyanogen-specific, those with com.android are possibly AOSP-based and those with google are from Google. Alternately, list package names via adb shell pm list packages and find out the app name of a certain package (e.g. using adb shell 'dumpsys | grep -A18 "Package \[org.cyanogenmod.audiofx\]"').
For launcher entries that are parts of other apps, dragging them either to Apps Info or Uninstall will reveal what parent apps they belong to.
Explore your Pico GAPPS zip package to see what it installs. The apps might not be in APK format (OpenGAPPS compresses them in tar packages) but the filenames are still recognizable. Every app not in the package is part of CM itself.
As for which CM apps are based off of AOSP... I'd say it's hard to definitively find out without digging into CM sources.
com.google.android.gms but that's what it is - a guess!
Cyanogenmod 12.1 comes with built-in (official CM) apps which contains the following apps (com.cyanogen.*):
There is available for CM12.1 builds an app package called "C-Apps Package" which (ships by default with CyanogenOS and) contains the following apps (com.cyngn.*):
This package will allow you to take your existing devices running CM 12.1, and make them more like the Cyanogen OS experience. […] C-Apps is being offered as an optional download and will not be preinstalled on CyanogenMod releases.
GApps Pico contains the following apps:
The rest apps are from the core Android system.
org.cyanogenmod.audiofx) and Themes (org.cyanogenmod.theme.chooser), plus the AOSP Gallery (com.android.gallery3d). I wonder if the CM versions of AudioFX and Themes are the same as the C-Apps ones... (but I'm going a bit O.T there)
org.cyanogenmod.audiofx), File Manager (com.cyanogenmod.filemanager) and Themes (org.cyanogenmod.theme.chooser). There is no Theme Store - the chooser direects the user to Google Play or the CM Wiki.