SENSS Assistive Technology 'QUICK Tip': Online Maths Tools

How can we access free online resources, that simulate physical Maths tools? 

SENSS Assistive Technology ‘Quick Tip’ - Online Maths Tools (pdf, 264kb)

The ‘Maths Learning Centre’ offers a number of free apps which can support with Maths, including fractions, geoboards, clocks, number frames, 100 squares, number lines, dienes and number racks. These can all be accessed through a web browser and some are also available on the Apple Store and Chrome Web Store.