Project dependent.

But generally projects will allow you to claim taxi fares after 9PM in the office...

Meal Allowances - I hear there are projects which allows claiming of meals up to a certain amount after certain hours like taxi... but while I was with ACN it had never been true, at least for the project I was in.

OIL - This is the reason why you HAVE TO KEEP TRACK of your own OT hours. It will be used to justify your OIL claim with your management and yes, you have to talk to your management on this. They don't auto keep track for you and will tell you 'hey, you've been OT-ing a lot during this period, take some OIL after finishing this milestone'. Wait long long. But also keep in mind that how many hours you OT doesn't equals to how many days of OIL. So don't expect much. I have colleagues who work ~100hours work week for weeks and the management only reimburse a few days of OIL. lol.

OT Pay - Have to talk to your management as well, but 99% won't get it.