Because in the hobby scene I work a lot with real theater organs and do not have the space at home to place such a large majestic organ, I went on a virtual tour.

And had to say, it comes very nearby. (Real remains better of course)

Hauptwerk does this very well. Today Hauptwerk5 is out, which means that there is no longer a free version of Hauptwerk.
If you have an acquaintance or friend who still has Hauptwerk4, you might be able to take it over.

After installing Hauptwerk, you still need sample sets (or the organs themselves).

Download Organ sample sets (such as a theater organ. Below are freeware)

• How to proceed. Have a look at this site. 

Paramount 310 theater organ	Barton 3/12 theater organ	Morton 3/10 theater organ

 

Elektrostudio Analogpack is a free collection pack with beautiful virtual synthesizers.
It can be downloaded as a collection pack at: http://www.elektrostudio.ovh.org/

Sixth Month June   Poliphonisch analoge syntesizer. * VCO with sawtooth and pulse waves  * Noisegenerator * LFO: Tri-angle * VCF: lowpass - cutoff, emphasis * A/D/S/R envelope with invert option. * Arpeggiator
Davosynth   Davosynth also has 2 oscillators. Unlike other synths, Davosynth has no waveforms for you to experiment with. Here you work with various pitches, i.e. 32', 16', 8', 4', 2', 1', and 1/2'
eSline String   String Ensamble. It is a multi-orchestra synth with violin, viola, trumpet, horn, cello and double bass. Sounds a lot like the Solina string ensemble
Micromoon   It is a mono synthesizer, with 1 variable waveform VCO. OSC waves - "Triangle / Pulse / Sawtooth-Pulse / Sawtooth".
Moon Sono Sx   The Moon Sono is a two-oscillator duophonic synth.
Ocet Rhythm Machine   Analog drum machine 6 sound modules with independent load/save option, and shuffle button 16 step sequencer, with 16 patterns, load/save option, random function.
ODsay   The ODsay is a two-oscillator duophonic synth.
OR2voice   Analog Duophonic Synthesizer 2 voices (2 sem modules) 2x Multitimbral (duophonic)
Rhythmus Drummachine   Rhythmus is inspired by an old drum machine. Ten buttons are available. Each button can play two different rhythm section, such as samba, mambo, tango, waltz, rumba etc. When you click "open", you can change the melody. You will hear a snare, bongo, cowbell, hi-hat, etc. You can mix Tambourine, Guiro, Quijada with the sounds.   Jean Michel Jarre has used a very comparative rhythm.
Tapeotronic   The Tapeotronic is a Mellotron-like keyboard. For example, it knows the sounds Flute, String and Choir

 

Dexed is a versatile virtual Synth.

It can be downloaded at: http://asb2m10.github.io/dexed/

 

 

It has many beautiful sounds and can be expanded almost infinitely with new sound patches.

Many of these patches are also available for free download on the Internet.

For example the "All the web patches collection"

 

 

To download at: http://www.genuinesoundware.com/?a=showproduct&b=37

 

 

 

To download at: http://www.amvst.com/

 

 

 

The "Analog" VST instrument Poly Ana is a great Synthesizer that can be used to create a lot of sounds and fun with a lot of buttons.

 

To download at: http://www.admiralquality.com/products/Poly-Ana/

 

 

In addition to 3 very flexible oscillators and 2 filters, the polyphonic synth also has 2 adjustable filters.
With 2 more modulation mixers, LFOs and 3 envelopes, the choice of sounds is unlimited.

 

The nice thing is that there are also various other skins (layouts) available, such as:

 

Or the next skin, with the same possibilities.

 

These skins can be downloaded at: http://www.admiralquality.com/products/Poly-Ana/skins.php

The Kamioooka is a polyphonic Full-Modular Synthesizer.
You can combine it with the so-called famous patch cables.
You can combine and patch various modules.

 

To download at: http://www.kvraudio.com/product/kamioooka-by-g200kg

 

 

There are 10 modules and 7 types of modules (VCO/VCF/VCA/ADSR/LFO/MISC/SEQ).

 

Such as:
VCO : Oscillator, with PWM/FM/Sync functions.
VCF : HPF/BPF/LPF filter.
VCA : Amplifier with modulation input.
ADSR : Two ADSR Envelope Generators.
LFO : Two LFO with tempo sync mode.
MISC : Ring modulator/Noise Generator/Sample&Hold/Inverter.
SEQ : 8 Step Mini Sequencer.

The Sonigen Modular. Also a great looking modular synth with patch cables.
To download at: http://www.vst4free.com/free_vst.php?plugin=Sonigen_Modular&id=1005

 

 

 

The 4 Front Piano is a VST instrument with no settings.

It is a piano plugin that simply sounds great. Like a piano should be. 

To download at: http://www.vst4free.com/free_vst.php?plugin=4Front_Piano&id=971

 

 

The Revitar is a very good sounding guitar with which you can play beautiful chords.
There is a lot to set and you can also choose 6 different guitars.

For a free VST instrument, it really belongs in your collection. 

To download at: http://www.vstplanet.com/Instruments/VST_Synthesizers12.htm

 

Who remembers the nice Casio organs we played with for hours.
One of the first portable organs. One had a Walkman with music.
We had a Casio VL tone.
So you had the VL-tone 5 (still in my possession) and the VL-tone 1.

This is also surprisingly well available as a VST instrument. Relive the old times. 

To download at: http://www.vstplanet.com/Instruments/VST_Synthesizers11.htm