Apache OpenOffice Templates
Templates - Presentations, Spreadsheets, Documents, Calendars & More
cover the 3 biggest document-creation sites (ie, Google Docs, Microsoft Office and Open Office).
Additionally, you can get a Kindle template at
Free template for writing Kindle books
Kindle Template | Apache OpenOffice Templates
and Social Media Templates at
12 Free Templates that'll Get Your Social Media Mojo Going SociallyStacked
I always try to personalize any template I use myself in my business. That way, I don't have to start from scratch with any project... I just have to modify my template.