Ad-hoc database queries

This report plugin allows Administrators to set up arbitrary database queries
to act as ad-hoc reports. Reports can be of two types, either run on demand,
or scheduled to run automatically. Other users with the right capability can
go in and see a list of queries that they have access to. Results can be viewed
on-screen or downloaded as CSV.
This report, created by The Open University, lets Administrators set up arbitrary SQL select queries that anyone with the appropriate permissions can then run. Reports can be set to be runnable on-demand, or automatically run weekly or monthly.
The results are displayed as a fairly plain HTML table, and can also be downloaded as CSV.
The idea is that this lets you quickly set up ad-hoc reports, without having to create a whole new admin report plugin.