What non-bugaboo accessories do you use with your Donkey 5?

Trying to save a little money and I haven't seen a thread like it yet - what non-bugaboo brand accessories work with the bugaboo donkey 5? Example: foot muffs, rain shields, cellphone holder, mosquito net, organizer, snack tray, water bottle holder.

And also which ones can you not live without and which are unnecessary?