Need advice to remove stumps

I have several stumps from where shrubs an/or hedges where killed. They are hard to mow near & weed wack around. It is not possible to remove by pulling out with a chain, because we have large boulders in our lawn landscape. I have tried manually pulling them out after digging around them but the roots have sprea far & wide. Any suggestions? I also have a very large diameter tree stump cut so close to the ground a chain will not stay on it. Help her would be much appreciated as well.
Thanks