multiIE
http://www.southwaycorp.net/
I use PIE. I read so many posts praising everything else, and honestly, I don't think any browser is a simple and functional as PIE. I browse mostly mobile websites anyway, don't have java on my phone [there goes Opera mini], and really don't like wasting memory if I don't have to [netfront, cya].
I may trie PIEPlus or multiIE though.