Contours explores how contours are used to represent a 3D 'landscape'.
Contours: about contours
Contours: mystery shapes
Contours: loony landscapes
Contours

Measuring explores similar shapes and objects and scaling using ratios.
Measuring: similar shapes
Measuring: scaling up
Measuring: scaling down
Measuring: similar solids
Measuring: scaling up solids
Measuring: scaling down solids
Measuring: scaling surface area
Measuring: volumes

Viewfinder requires users to arrange a 3D scene so that a 'photo' from a certain angle replicates a given 2D picture.
Viewfinder: up front
Viewfinder: flip side
Viewfinder: backwards glance
Viewfinder: all angles
Viewfinder

NLVM: Space manipulatives
Pentominoes
Tessellations
Pattern blocks
Geoboard
Geoboard: coordinate
Geoboard: isometric
Congruent triangles
Platonic solids
Polyominoes

Learn Alberta: Exploring Space series.
Exploring angles
Exploring dilations
Exploring quadrilaterals