Tools on the web can be used on computers, phones and other internet devices.
Forio, from Forio Online Simulations, allows you to build web based interfaces to models you have developed and also provides a library of interactive environments for curious users to explore. The software is web hosted, with a commercial use license, but provides a number of options for low cost and no cost publication and proliferation of models and model results.
iMODELER, from iMODELER, allows you to build web based models. The software is free for educational purposes. It runs on all operating systems including smartphones and tablets.
Insight Maker, from Insight Maker, from Gene Bellinger.
Sysdea: from Sysdea
Stella Modeler for iPad: Stella
BROADVIEW: BROADVIEW, Unravel, play, discover, decide and undertake. BROADVIEW helps to quickly get a complete overview of a complex situation.