Many folks do not know that Microsoft maintains, on their web site, pages of FREE Microsoft Office templates. There you will templates for resumes, cover letters, calendars, flyers, planners, newsletters, presentations, brochures, reports invoices and themes. I have found that many of these templates are compatible with third party office suites, such as LibreOffice.
Choose from thousands of free Microsoft Office templates for every event or occasion. Jump start your school, work, or family project and save time with a professionally designed Word, Excel, PowerPoint template that’s a perfect fit.
Source: Office templates & themes