A very well-respected specialty geotechnical contractor. They have a number of nice technical articles and case studies published on their website.
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TerraSystems Incorporated
TerraSystems is a geotechnical contracting firm specializing in dynamic compaction, rammed aggregate columns, wick drains, and various vibro systems for improving poor soil conditions. They are based in Lovettsville, Virginia. Visit TerraSystems Incorporated

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Grokking GeoStudio
Grokking GeoStudio is an unofficial blog by a programmer on the GeoStudio team. Visit Grokking GeoStudio

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GeothermEx Inc – Geothermal Consultants
We are the largest, most comprehensive geothermal consulting and services firm in the Western Hemisphere. We have served a large and diverse client base in evaluating and developing hundreds of geothermal projects in more than […]