Xslimmer is described as 'Your Mac on a Diet With Xslimmer - Universal Application Slimmer for Mac OS X 10.3 and up. Xslimmer, the friendly way to right-size your apps without losing functionality'. There are four alternatives to Xslimmer for Mac. The best alternative is Monolingual, which is both free and Open Source. Other great apps like Xslimmer are MacClean (Paid), MacBooster (Paid) and WeCleanse (Free).