Long before Android became common on tablets, much less started showing up on ereaders, Pocketbook had quietly made a name for itself by supporting a framework of 3rd-party apps on its ereaders.
That framework was never very well organized, and it was never very well developed on a technical level, but it is possible to find and install apps on the InkPad and other Pocketbook ereaders.
I have not been able to install any additional apps on my InkPad, but it did ship with thirteen (13) apps. This excludes core InkPad functions like the settings menu, bookstore, and stock reading apps, but includes things like the Dropbox client.
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app compatible with your specific Pocketbook device and copy the app file to the applications folder (and sometimes also to the system/bin folder). For more details, ask over at MobileRead
I have not been able to install any additional apps. This is due in part to the fact that the process is a PitA, but also because I made the mistake of updating my InkPad from a v4.x firmware to a v5.x firmware. Most of the apps were developed for the older frmware.