nanoCAD

https://nanocad.com/products/construction/download/

nanoCAD is an easy-to-use CAD application that delivers a great user experience by providing high performance, full capability, a classic interface and native .dwg format support.

DWG FastView-CAD Viewer & Editor - Android APK

https://play.google.com/store/apps/details?id=com.gstarmc.android&hl=en

DWG FastView is a cross-platform CAD software that meets designers’ demands in all kinds of situation, and fully compatible with DWG, DXF. Various of CAD features such as: Edit, View, Measure, Dimension, Find text, etc. enables you do real CAD work on the go and enjoy the best mobile CAD experience.

View, Edit, Create & Share all your CAD drawings, synchronize to cloud from multiple devices by one click, enjoy design anytime anywhere together with more than 25 million users around the world. 

Flat Pattern Bend - Android APK

https://play.google.com/store/apps/details?id=ru.sotnikov.flatpattern&hl=en

    

Calculator will calculate the necessary dimensions for the construction flat pattern segments lobsterback bend, elbow , tee piece, frustum cone and truncated pipe, flat back cone, oblique cone tee, offset tee, oblique transition from Squar/ Rectangle to Round, auger segment, transition from rectangle to square, truncated cone with an accessible vertex and triangulation method.

Calculation flat pattern used as a template for cutting the pipe, producing with wall thickness s = 0.

Added the function of saving a flat pattern to a DXF file for 7 figures . The file is saved to the Download / DXF / folder (permission to write the file is required).

Maths Formulas Free - Android APK

https://play.google.com/store/apps/details?id=com.nsc.mathformulas.lite&hl=en

 

Available in many languages, this is a perfect app on Google Play that provides all basic formulas in mathematics. It's very convenient for all students in high school or university and engineers to look for any easy or complicated formulas. It includes: Geometry , Algebra ,  Trigonometry ,  Equations ,  Analytic Geometry ,  Differentiation , Integration,  Matrix,  Probability and statistics,  Units Conversion,  Math Tricks...  This app also has many tools to calculate the geometric shapes or find the roots of equations. 

KONIČNI ZATIK - TAPER PIN - DIN 1 - Taper and angle calculation

http://www.magafor.com/841/uk.htm#

Fill-in below, three of the parameters from your borehole, then the remain parameter will be automaticaly calculated.

Ispunite tri parametra konične rupe, preostali parametri će se automatski izračunati.