examples:
"there is little else I can do" "there is little else that can be done" "there is little else he/she/we/they can do"
"there is little else that [x] could have been done" where there is [X] you can put I/you/we/they
It basically means you have tried everything possible or that you can think of, there is nothing else that can be. A good example of using this is when a person is terminally ill and the doctors decide to do no more.