A great place to start your search for free InDesign brochure templates is Adobe.com. This makes sense since Adobe makes InDesign and maintains a vibrant online community where you can share resources with other InDesign users. As usual, when downloading from Adobe.com you will need your Adobe ID to login.
Xerox QP BrochureUSLedgerImposed is a brochure template made available by Quick Print Solution. This brochure comes with a PDF document describing how to best use the template. When you click the download button, your browser will download the template as a zip file which you can expand into the folder of your choice.
To use the template, double click on the ".indt" file and Adobe InDesign should open. This is a 4 page, 11x17 front and back design suitable for promotional pieces or product collateral.
8.5x11 Brochure template letterfold/trifold offers a prepared layout that makes it fast and easy to design your brochure from scratch using a common size of paper. Just download the ".indt" template file and open it in Adobe InDesign and you are ready to go. This templates is front and back and perfect for informational brochures and more.
A tabloid sized trifold and an A5 trifold template similar to this one are also available for free.
The Technology Business Tri-Fold Brochure Template is a predefined brochure intended for use with technology oriented companies. Although the template comes with stock images and text, you can easily substitute them for your own and save your template as a new creation. This template makes it fast and fun to produce quality handouts. Be sure to visit the InDesign download area to download these and other free InDesign brochure templates.