This is the Offline app for engineers.
This app contains following topics.

1 Representative factor.
2 Plain scales.
3 Diagonal scales.
4 Construction of ellipse.
5 Construction of parabola.
6 cycloid.
7 Cycloid.
8 epicycloid.
9 hypocycloid.
10 Involutes.
11 Archimedean.
12 logarithmic spirals.
13 Types of projection.
14 Orthographic Projections.
15 First and Third Angle Projections.
16 Line parallel to a plane.
17 Line inclined to a plane.
18 Projection of a line parallel to both HP and VP.
19 Line perpendicular to HP parallel to VP.
20 Line parallel to VP and inclined to HP.
21 Line inclined to HP and VP.
22 Rotate the line AB to make it parallel to VP.
23 Projections of planes.
24 Plane surface parallel to one plane and perpendicular to the other two.
25 Plane parallel to HP and perpendicular to both VP and PP.
26 Plane parallel to PP and perpendicular to both HP and VP.
27 Plane surface perpendicular to one plane and inclined to the other two.
28 Projection of Solids.
29 Sections of Solids.
30 Visualization of Section Views.
31 CUTTING PLANE LINES.
32 Placement of Cutting Plane Lines.
33 Full Section View.
34 Broken-Out Sections.
35 Parallel Line Development.
36 Radial Line Development.
37 Isometric Projection.
38 Foreshortening.
39 Isometric Scale.
40 Alternative Isometric Scale.