Build your ZIM file
A few tools allow people to create ZIM files.
MediaWiki Collection Extension
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You can create on Wikipedia and all other Wikimedia projects, ZIM files of article selections. For example on http://en.wikipedia.org. This is based on the MediaWiki Collection Extension. The Collection extension for MediaWiki provides the ability to select articles and export them in different formats, such as PDF, ODF and ZIM. The main purpose of Collection extension is to create printed books - instead of export you can also choose to have the selected articles printed on demand as a real book.
The Collection extension can be easily added to any MediaWiki installation:
Ask for a custom ZIM file
MWoffliner is a tool which allows to "dump" a Wikimedia project (Wikipedia, Wiktionary, ...) to a local storage. It should also work for any Mediawiki instance having parsoid installed. It goes through all articles (or a selection if specified) of the project and write HTML/pictures to your local filesystem. More information are available here.
zimwriterdb is part of the openZIM project. This binary uses a pre-filled Postgres Database and create the corresponding ZIM file; the schema for the database is linked on the main zimwriterdb page.
Wiki2html can be used to prepare static HTML files from a running Mediawiki instance.