Derby depends on nothing else at Apache (except ant for its build), and is depended on by nothing else at Apache.
Let's not forget that the Derby codebase extends back to the dim dark distant days of the 1990's before many of the ASF's Java projects even existed.
Moreover the project needs to limit the number of external dependencies so that it remains easy to embed, which is still a design goal.
As for use by other projects, most are database agnostic and can use Derby through the JDBC API. We use it in Geronimo to provide database services to applications and may extend that to internal data at some point. Craig has said JDO is using it and I believe Torque now supports Derby data bindongs as well.
-- Jeremy
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