Diep Scripts

1) Aimbot
This is the one script I don't want to give away, because it'd make the game unfair. That said, here's the function i use to predict movement, for informational purposes:
function intercept(src, dst, v) {
	var tx = dst.x - src.x,
		ty = dst.y - src.y,
		tvx = dst.vx,
		tvy = dst.vy;

	// Get quadratic equation components
	var a = tvx * tvx + tvy * tvy - v * v;
	var b = 2 * (tvx * tx + tvy * ty);
	var c = tx * tx + ty * ty;

	// Solve quadratic
	var ts = quad(a, b, c); // See quad(), below

	// Find smallest positive solution
	var sol = null;
	if (ts) {
		var t0 = ts[0],
			t1 = ts[1];
		var t = Math.min(t0, t1);
		if (t < 0) t = Math.max(t0, t1);
		if (t > 0) {
			sol = {
				x: dst.x + dst.vx * t,
				y: dst.y + dst.vy * t
			};
		}
	}

	return sol;
}
function quad(a, b, c) {
	var sol = null;
	if (Math.abs(a) < 1e-6) {
		if (Math.abs(b) < 1e-6) {
			sol = Math.abs(c) < 1e-6 ? [0, 0] : null;
		} else {
			sol = [-c / b, -c / b];
		}
	} else {
		var disc = b * b - 4 * a * c;
		if (disc >= 0) {
			disc = Math.sqrt(disc);
			a = 2 * a;
			sol = [(-b - disc) / a, (-b + disc) / a];
		}
	}
	return sol;
}

Use the above like:

let t = intercept({
    x: mainCircle.x,
    y: mainCircle.y
}, {
    x: target.x,
    y: target.y,
    vx: avgXV - myXV,
    vy: avgYV - myYV
}, bulletSpeed);
t will have the x and y you should aim at (use Math.atan2)
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2) Visual mods
These are the elegant one-liners! There's two categories, globalCompositeOperation and filter.
To run code, all you have to do is press f12 or ctrl + shift + i on diep.io to open a developer console. Then, in the space, type the code, hit enter, and you should see the screen change.
a) GCO
canvas.getContext('2d').globalCompositeOperation = <filter>
where <filter> is one of the following: 'lighter', 'xor', 'multiply', 'overlay', 'darken', 'color-burn', 'hard-light', 'soft-light', 'difference', 'exclusion', or 'luminosity' (with the single quotes but not the commas)

b) filter
Just type one of the following:
canvas.style.filter = 'sepia(100%)';
canvas.style.filter = 'hue-rotate(100deg)';

or my personal favorite, rainbow:
setInterval(() => {
	canvas.style.filter = ''
}, 1000 / 60)

3) 3D mods
True 3D script (broken): https://greasyfork.org/en/scripts/432833-diep-io-3d/code
Fake 3D script shown in the video:
var shaderButton = document.createElement('button');
document.getElementsByTagName('body')[0].appendChild(shaderButton);
shaderButton.style = "position:absolute; top:10px; left:10px; z-index:10000;";
shaderButton.innerHTML = "Turn on the shader or something lol";
shaderButton.onclick = function() {
    input.set_convar('ren_background', false);
    document.getElementById('backdrop-asset').style.opacity = 0;
    shaderButton.style.display = 'none';
}

var c2 = document.createElement('canvas');
c2.style = "position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:-1;";
document.getElementsByTagName('body')[0].appendChild(c2);
var ctx2 = c2.getContext('2d');

var c = document.getElementById('canvas');
var ctx = c.getContext('2d');
c.style.opacity = 0;

var i = 0;

var depth = 6;

c2.width = c.width;
c2.height = c.height;

window.addEventListener('resize', function() {
    c2.width = c.width;
    c2.height = c.height;
}, false);

function loop() {
    ctx2.clearRect(0, 0, c2.width, c2.height);
    ctx2.drawImage(c, Math.pow(2, depth - 2), Math.pow(2, depth - 2), c2.width - Math.pow(2, depth - 1), c2.height - Math.pow(2, depth - 1));
    for (i = 0; depth > i; i++) {
        ctx2.drawImage(c2, -Math.pow(2, i), -Math.pow(2, i), c2.width + Math.pow(2, i + 1), c2.height + Math.pow(2, i + 1));
    }
    requestAnimationFrame(loop);
}
loop();
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4) My own version of diep!
https://tmzg.onrender.com (hosted on render.com, a free hosting platform)