Build your ZIM file
A few tools allow people to create ZIM files.
Users
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 (see below).
Developers
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:
zimwriterfs
zimwriterfs is a console tool to create ZIM files from a localy stored directory containing a "self-sufficient" HTML content (with pictures, javascript, stylesheets). The result will contain all the files of the local directory compressed and merged in the ZIM file. Nothing more, nothing less. zimwriterfs works, for now only, on POSIX compatible systems. You simply need to compile it and run it. The software does not need a lot of resources, but if you create a pretty big ZIM files, then it could take a wile to complete. Go to zimwriterfs source code repository.
zimwriterdb
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
Wiki2html can be used to prepare static HTML files from a running Mediawiki instance.