Several days ago, and just by chance, I have discovered that applets on Ultrastudio.org do not run any longer, thanks to the Oracle requirement to sign also applets that run in a sandbox.
It may be a question if one should purchase a signing certificate for over one hundred of dollars per year, for a project that has never generated any revenue. However I was even desperate enough to apply. Unfortunately even this was not helpful: the provider said certificates can only be issued for the officially registered companies and official non profit organizations. Being individual, I am neither one nor another.
The last attempt I may try, maybe some providers issue free certificates for open source projects, if they also do not put the same requirement that open source project should be run like a company. If not, that is the end of the Ultrastudio project.
Platform that requires a yearly fee just to allow others to run your code, and only if you are on behalf of some company, seems not the best for the Free software anyway.