WikiReader

WikiReader was a project to deliver an offline, text-only version of Wikipedia on a mobile device. The project was sponsored by Openmoko and made by Pandigital, and its source code has been released.
The project debuted an offline portable reader for Wikipedia in October 2009. Updates in multiple languages were available online and a twice-yearly offline update service delivered via Micro SD card was also available at a cost of $29 per year. Wikireader versions of the English Wikipedia, Wiktionary, Wikiquote and Project Gutenberg can be installed together on a user-supplied 16 GB Micro SDHC Memory Card. Unlike Wikipedia itself, the device features parental controls.
The device can also run programs written in Forth; a simple calculator program is included.
In late 2014, the WikiReader website and project itself were shut down and abandoned for unknown reasons. Existing WikiReaders no longer receive updates to their database. Devices and homegrown updates keep on being available to date from the secondary markets, as well as from community efforts centred around the WikiReader subreddit.
Updated Wikireader Images.
The last official wikireader image was released by Pandigital in 2011. However, there an exists an active fork of the original software capable of producing new images. There's also an active reddit community where new wikireader images are shared and discussed.
The latest update was released by this community in December, 2020.