Chess software that enables you to set up a position from scratch? I'm looking for chess software (free or otherwise) that will allow me to completely clear the board and set it up as I wish in order to analyze a specific situation. All of the chess puzzle software I've seen seems to have only pre-loaded positions to solve.
You don't mention what platform you are using, but on Android I use the "Analyze This" app - it lets you set up positions from scratch, and also use an engine to analyze.  There is a free version of the app, and a paid "Pro" version.  In the free version, the only available engine is Stockfish; in the "Pro" version, you can add other UCI engines.