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Chex ('change extension') changes extensions on files. It's the Cocoa version of the command line ACP tool chex. It's a bit more sophisticated but GUI apps sometimes have to be.
Just launch it - and start dragging files onto it. Copy, cut, delete, and paste items as you see fit. And put an extension in the box at the bottom (or leave it blank to remove extensions) and click 'Change' or hit Enter. All done.
The slash ('/') is not allowed in an extension; neither is the dot ('.') as the first character - the Cocoa frameworks have a difficulty dealing with this scenario.
You can add as many extensions to your files all at once; remove extensions successively by submitting the 'empty' extension.
Chex checks all renames for potential conflict before an operation and gives you the chance to back out.