Apps similar to MidiTransposer include MidiKeySwitcher. It's paid, but MIDI Transform is free. Other options are AutoTonic. In total there are three apps like MidiTransposer for Windows and Mac.
MidiKeySwitcher is a Midi Plugin that lets you configure 2-key switches to select an output Midi Channel, Octave Shifts and send Midi Messages to select Programs and Banks and SubBanks from a Midi keyboard set to a fixed channel.
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MIDI Transform helps you do simple, non-realtime MIDI transforms like volume and velocity changes, transposing of notes and mode changes.
AutoTonic is an advanced, real-time MIDI note transposer with up to 24,576 scales to give you the full power of music theory.
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