OpenInkpot, the project for creating free/open source firmware for Hanlin/lBook eReader v3 just started:
project page. Future similar hardware, such as v9 will probably also be suported.
We're currently in early stage of development, making the working kernel, kdrive (X.org) and base libraries and welcome any volunteers - hardware/kernel/unix/X hackers at the moment, application developers a bit later, when the infrastructure will be more mature.