There are also community firmwares, the biggest one being Omega (https://github.com/Omega-Numworks/Omega), which adds lots of functionality such as RPN or CAS (giac through an external app).

The company behind NumWorks has the openness of their platform as a major selling point. As such, the source code of their firmware is available on GitHub and the engineering documents of their calculator is on their website (https://www.numworks.com/resources/engineering/). They've also shown much more good faith toward their community in the couple of years they've been around than TI ever did in the last 15 years.

Many in the calculator community are extremely pissed at TI. They've just removed a significant feature of a sold product through a software upgrade unilaterally, unannounced, without consulting with their community beforehand to try and work out alternative solutions. Last time Sony tried to do something similar (OtherOS on PlayStation 3), it ended very, very poorly for them.

The fact that their official replacement for ASM/C programs is a Python interpreter running on a Cortex-M0 co-processor with 32 KiB of RAM and a put_pixel() fill rate of 48 pixels per seconds only adds insult to injury.