Integrity Consulting
- Offering a series of spreadsheets designed for reservoir evaluation, facilities design, well stimulation, and economic evaluation/projection.
- http://www.petroleumtoolkit.com/

Applied Computer Engineering Inc.
- Geostatistical software for reservoir studies. PC software for reservoir simulation. Consulting and training.
- http://www.gridstat.com/

Jason Geosystems
- Quantitative reservoir models incorporating seismic,well log, petrophysical and geostatistical elements. Related consulting.
- http://www.jasongeo.com/

Sensa
- Using permanent optical fiber and sensors to provide real time whole-wellbore and whole-reservoir data.
- http://www.sensa.org/

SLOOP
- Simulates the complete operation of an offshore oil or gas field and enables the user to optimize the production, export and transportation.
- http://www.sloop2.co.uk/

Molli Computer Services, Inc.
- Economic evaluation software for wells and producing properties. Based in Colorado Springs, Colorado.
- http://www.mcsi.com/

Petro-Geotech Inc.
- Includes software for reservoir optimization, frac design, thermal stimulation, sand control, wellbore stability, horizontal drilling and underbalanced drilling. Located in Calgary, Alberta, Canada.
- http://www.pgi-ca.com/

Central Technologies Inc.
- Accounting software for petroleum producers and investors. Based in Oklahoma City.
- http://www.centralt.com/

DataHorizon Ltd.
- Bringing remote oil well data to the desktops of engineers. Based in Oxford, UK.
- http://www.datahorizon.net/

Vertex System Resources Ltd.
- Integrated enterprise information systems for exploration and production operators. Located in Calgary, Alberta, Canada.
- http://www.vertexsr.com/

GeoMechanics International, Inc.
- Software, consulting and training services for the petroleum and geotechnical industries. Specialists in in-situ stress analysis, wellbore stability, wellbore image analysis and drilling engineering.
- http://www.geomi.com/

Geologix Limited
- Developer of the GEO Software Suite of applications for petroleum wellsite and operations geologists. Headquarters in Norwich, UK.
- http://www.geologix.com/

Infoil International
- Oil and gas software company from Argentina, describing software for analysis of oil well production and perforation.
- http://www.infoil.com.ar/

ELynx Technologies
- Provides real-time data collection, production reporting, trending, monitoring and control -via the Internet- for the oil and gas industry.
- http://www.elynxtech.com/