There are numerous other communication tools you can use in a public relations effort. Here are just a few suggestions:
A speech at a Linux trade show.
A presentation at a local training institution or career development conference.
A brochure or flyer describing the work your company does.
A white paper describing the benefits of your company's work, posted on your website.
A newsletter or email newsletter describing your organization's activities and achievements, aimed at current and prospective users.
An advertisement placed in targeted magazines.
Special events such as open houses and “media information” days.
Regular tours of your facility.
The possibilities are limited only by your time, resources, and budget.