All of the following resources are interactive and great for teaching online or on an interactive whiteboard. Spending a little time exploring the options allows them to be used to their full potential.

100 square
www.topmarks.co.uk/learning-to-count/paint-the-squares - clear and simple to use.
www.ictgames.com/mobilePage/hundredSq - twist the dial to show numbers greater than 100 or less than zero.
www.mathsbot.com/manipulatives/hundredSquare - show as base 10 images and show numbers greater than 100 or less than zero. www.mathsframe.co.uk/en/resources/resource/71/itp-number-grid - hide numbers under a shape, alter the number of columns and explore multiples

Dice
Using google, search 'dice roller' - polyhedral dice with 4, 6, 8, 10, 12 or 20 sides
www.diceroll.fun - polyhedral dice as above, but also % dice to generate a 2-digit number
https://content.connect.collins.co.uk/Content/Live/ElektraMedia/Busy_ants/Foundation/GamesandTools/34_IMT_Dice/index.html - up to 3 dice with from 2 to 10 sides, showing adjustable dots or numbers

Dienes (base 10)
I find it useful to shrink the blocks before beginning, to give more work space.
https://mathigon.org/polypad#number-tiles – up to thousands, which you can split and merge for exchanging/regrouping. Shrink the first block and others will then be the same size.
https://mathsbot.com/manipulatives/blocks - up to thousands using differently coloured blocks, which can be exchanged or grouped. Shrink to desired size, then hit ‘Tidy’.
https://www.mathlearningcenter.org/apps - up to hundreds, either the same or different colours, which can be exchanged/regrouped.

Multiplication square
www.visnos.com/demos/times-tables
www.mathplayground.com/interactive_multiplication_chart.html
www.teacherled.com/iresources/numeracybasics/?resource=multisquare