monstrumWaveXL or (mwaveXL) is a Lua based cross platform application which sends MIDI and sysex data to/from the Waldorf Microwave II/XT/XTk from either standalone mode or as a VST in your favorite DAW.
This is not a software emulator of a Waldorf synth, it is an editor for the actual synth thus requires a Waldorf microwave (xt xtk or II) synthesizer.
TSE3 is a powerful third generation open source MIDI sequencer engine written in C++. It is a 'sequencer engine' because it provides the actual driving force elements of a sequencer but provides no form of fancy interface.