Notable ones are:

* Patterning 3 - which, while "just" a drum sequencer, has the ability to automate rotations, etc. in really interesting ways, as well as separate sequences for each part of the kit.

* 4Pockets Euclidean - gives you four different sequences, with adjustable steps, events, rotations, notes to play, velocity, ... for building interesting rhythms.

* Riffer - MIDI random sequence generator

* OODA and ZOA - sequencers with clever morphing and looping abilities

* Battlestation - drum sequencer with random generation, lots of manual adjustments, and then three different synth blocks with random generation.

If you have an iPad already, most AUv3s are generally from free to $30, so somewhat cheaper than going Eurorack :-)

Also, there are things like Drambo that pretty much are Euroracks, and things like Loopy Pro that are not really like anything else (well, LP is kind of like a Boss 505, if the Boss had an arbitrary number of loops, incredible automation, several built-in plugins plus the ability to use pretty much any AUv3 plugin, and the ability to control those plugins...).

It's all kind of an incredible rabbit hole to go down. TONS of fun.

Recently, I've has some success at working out ways to derive some of the Euclidean rhythms by solving for the zero crossings, so now I'm pretty sure that this continuous rhythm synthesis is also capable of all the Euclidean variations.

Experiments: https://youtu.be/zeHJXyyhJ70 https://youtu.be/zILWhOu--Go

A little performance using a Gametrak controller. https://youtu.be/SlSujIOGamk