The Nifflas Object (which was actually created by Jamie)
My role in it was just that I hired Jamie to create it.

Everything in this extension can be done in MMF2 without any extensions at all. However, it simplifies many operations that I do so often that it would be best to have dedicated expressions for them. This extension will keep growing as I need more features.

Randomization
The ability to randomize a number within a given range, and blocking a number somewhere in the range (useful for e.g. play a random song, but not the previously played one).

Sine
Same as Sin() but with a bit more customization. Again, nothing that can't be done with a normal expression, but this helps the expressions to look a bit more simple.

Limit
Same as Max(Min([value]),x),y) but prettier

Substr
PHP style substr with support for negative start and length values. Really powerful, replaces many irritating left$/mid$/len combinations.

Timers
Nice and simple way of doing something every Xth frame.

Here's a new update of the extension!

Cosine
See Sine

Nearest
Let you specify two numbers, and check which of those two numbers a third one is closest to.