The OpenInkPot project (has its own forum) uses FBReader and CoolReader, and you can download its source code. That is probably the most accessible versions of those renderers. The standard Desktop version of FBReader works more or less "as is" on the iLiad and DR1000S, because they have touch screens. OpenInkPot also has a PDF renderer, but I'm not sure what it is based on. Often these are based on xpdf or poppler. ADE includes a basic PDF renderer, and so replaces xpdf/poppler for PDF.
Barnes and Noble (Fictionwise) apparently have a SDK for the eReader format. It is propriety, but will be included on the DR800SG.
The Mobipocket Java-based SDK was the most popular DRM-ridden engine for a while. It does not seem to be used on any new EInk devices coming to market recently, with the exception of the Amazon Kindles (Amazon owns MobiPocket) and the Bookeen Opus (using an as yet unreleased firmware).
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