To the best of my knowledge TGC have no plans for monthly prescriptions
but as some of the plugins may be completed by other people on the forum
they may indure their own fees.
With that said AppGameKit classic was the first of the developments which has now
evolved into AppGameKit Studio which has many changes such as the engine behind
it. But TGC have still said they will continue to support AppGameKit classic with updates
one update only came out two days ago for me
and unlike other development tools you have complete royalty free use to use
for development of any project yourself not including a tool that is the same.
It also isn't a requirement to add the AppGameKit logo to peoples software developed
with AppGameKit altho many of us like to see it