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.