Try to think of something advanced but theoretically possible that would rapidly proliferate. No weapons.
My first thought was some kind of farm tech leading to a second agricultural revolution, allowing AES countries to thrive despite sanctions. Some leap forward in permaculture or vertical farms or whatever.
Another idea was a breakthrough in cryptography makings comms be completely anonymous, giving insurgent movements a more even playing field.
The means of production but pocket sized and easy to replicate and pass on to someone else
Or maybe just renewable energy that's easy to generate in large quantities and is easy to get set up without capital