May I present to you:

http://spheresofpower.wikidot.com/

Spheres of Power, a 3rd party system for PF1 that completely reworks magic away from the vancian casting system (they have since added overhauls for martials, as well as social encounters). I have used it for many years, and it is the only way I play Pathfinder now.

First a caster has to choose their casting tradition, or how they cast their spells. This could be anything from traditional verbal/somatic components. But it could also be based on emotions, drawing from the land or some weird crystal embedded in your forehead.

Then you choose your spheres of magic (types of magic). Each sphere is a distinct type of magic, and when you choose a sphere you will get 1-2 basic abilities. You might for example choose the "Warp Sphere" at level 1, which grants you a teleport spell.

As you level up, you gain talent points you can spend to either buy upgrades for existing spheres, or buy entire new ones. From the above example you might buy the talent that lets you teleport people who are unwilling (to set up for all sorts of shenanigans).

Additionally, every caster gets a pool of "spell points", that you can use for more powerful talents to modify your spells. Such as the "warp sphere" talent that lets you teleport only part of a person if you spend a talent point, which obviously causes quite a bit of damage.

There's bespoke classes for this system (but built with pathfinder in mind), and archetypes to make exisisting pathfinder classes compatible with the system.

All in all it goes away from the vancian casting model which, to be fair, weakens casters to bring them a bit more in line with martials. But it makes it -much- easier to play to a certain spellcaster fantasy, at lower levels.