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Well-Known Users of SQLite:

A few of the better-known users of SQLite are shown below in alphabetical order. There is no complete list of projects and companies that use SQLite. SQLite is in the public domain and so many people use it in their projects without ever telling us.

Adobe uses SQLite as the application file format for their Photoshop Lightroom product. SQLite is also a standard part of the Adobe Integrated Runtime (AIR). It is reported that Acrobat Reader also uses SQLite.
Apple uses SQLite for many functions within Mac OS X, including Apple Mail, Safari, and in Aperture. Apple uses SQLite in the iPhone and in the iPod touch and in iTunes software.
The increasingly popular Dropbox file archiving and synchronization service is reported to use SQLite as the primary data store on the client side.
SQLite is the primary meta-data storage format for the Firefox Web Browser and the Thunderbird Email Reader from Mozilla.
We believe that General Electric uses SQLite in some product or another because they twice wrote to the SQLite developers requesting the US Export Control Number for SQLite. So presumably GE is using SQLite in something that they are exporting. But nobody (outside of GE) seems to know what that might be.
It is known that Google uses SQLite in their Desktop for Mac, in Google Gears, in the Android cell-phone operating system, and in the Chrome Web Browser. People are suspicious that Google uses SQLite for lots of other things that we do not know about yet. Engineers at Google have made extensive contributions to the full-text search subsystem within SQLite.
McAfee uses SQLite in its antivirus programs. Mentioned here and implied here.
It can inferred from traffic on the SQLite mailing list that at least one group within Microsoft is using SQLite in the development of a game program. No word yet if this game has actually been released or if they are still using SQLite.
The popular PHP programming language comes with both SQLite2 and SQLite3 built in.
SQLite comes bundled with the Python programming language since Python 2.5.
The REALbasic programming environment comes bundled with an enhanced version of SQLite that supports AES encryption.
There are multiple sightings of SQLite in the Skype client for Mac OS X and Windows.
Solaris 10 uses SQLite as the storage format for its Service Management Facility. Thus, Sun has essentially replaced the traditional unix /etc/inittab file with an SQLite database.
SQLite is an integral part of Symbian's operating system commonly found on high-end cellphones.
A representative of Toshiba wrote to the SQLite developers and requested the US Export Control Number for SQLite. We infer from this that Toshiba is exporting something from the US that uses SQLite, but we do not know what that something is.