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Surveying Calculation plug-in for QGIS 2.x

• Users' Guide: http://digikom.hu/SurveyingCalculation/usersguide.pdf
• Tutorial: http://digikom.hu/SurveyingCalculation/tutorial.pdf
• Developers' guide: http://digikom.hu/SurveyingCalculation/devdoc.html

There is an other project GeoEasy which has wider functionality but not from QGIS.