Written By Terry Doner. Jan 9, 2021. Updated April 1, 2021.
Here you will find a quick index of helpful software in many different categories. Which ones are best for your task depends a lot on your particular needs. Feel free to suggest others using the form at the bottom.
Google Draw is good for simple drawings and is web based. Free.
https://docs.google.com/drawings
For more sophisticated technical drawings, considered these:
Viso : https://www.microsoft.com/en-ca/microsoft-365/visio/flowchart-software
Draw.io : https://app.diagrams.net/
Luciddraw : https://www.lucidchart.com/pages/
https://h2rgear.com/
Programmatically you can create Graphviz diagrams, say using software like DiagrammeR.
These tools are 3D modeling, animation and rendering applications.
Sketckup
There is a free version on the Web, plus the "Make 2017" is free and can be downloaded.
Autocad
Rhino
3ds-Max
Cinema 4d
https://www.maxon.net/en/cinema-4d
Adobe Creative Cloud, in particular Photoshop, Illustrator and AfterEffects. This software is not cheap, but is a very common professional suite of tools.
Gimp - an open source / free alternative to Photoshop.
Inkscape - a free vector graphic alternative to Illustrator
Affinity Photo and Designer are somewhat equivalent to Photoshop and Illustrator.
Houdini - procedural graphical design
There is a free version
Maya
Blender
Canva
This category of software not only allows the construction of a 3D model of a space but you can add to it multiple viewpoints such as engineering or construction views. See https://en.wikipedia.org/wiki/Building_information_modeling
Revit
Lightwright
Common in the theatre.
Vectorworks
Common in the theatre.
ELM
MadMapper - does pixel mapping and Projection mapping
Madrix
https://www.madrix.com/products/software
LightJams
Chamsys MagicQ
Redot - pixel mapping Design
Pharos
https://www.pharoscontrols.com/
Arkaos - pixel mapping and VJ software
D3 - also a media server
Disguise Designer
https://www.disguise.one/en/products/designer/
Radical Lighting PixelDrive (Seems defunct) – http://www.radlite.com/
Light Factory (hardware)
E:CUE
https://www.osram.com/ecue/about-ecue/index.jsp
Meant for architectural installations
dotMatrix (.Matrix) - free but not maintained and quite old
https://ljb2of3.net/dotmatrix-2/
Various see this wikipedia page which already has a good list.
https://en.wikipedia.org/wiki/List_of_lighting_design_applications
Dialux and Relux are well recognized
Ease
SMAART
Various Room Acoustic Tools
Wave file manipulation and correction https://www.sounddevices.com/product/wave-agent-software/