Free Software
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Special thanks to ESW-RIT for creating the original version of this list!
3D Modeling Software
Autodesk Fusion 360 (download)
A complete 3D modeling package available to current students. In most ways, it is comparable to SolidWorks. A tutorial from a past ESW workshop can be found here.
A free online modeling program with most of the basic functionality of full paid services.
2D Graphic Editors
A vector-based image-editing software. Vectors are images that are saved as relative coordinates, rather than pixels. Both types of images have advantages and disadvantages, depending on what you're using them for. For example, vector images are used in laser cutting, while raster images are used in laser engraving.
A raster-based image editing software (rasters are images comprised of pixels). Paint.NET is a very robust program, and it can easily be used to create graphics and edit photos.
Audio & Video Editors
A basic audio recording and editing software. It also has a menu for frequency analysis, which can be very useful if you're engineering something with audible vibrations (and you're on a budget).
A basic screen-capturing software, which can be used to record discussions and tutorials.
A basic video-editing software, which can be used to compiled video and audio from other sources.
Disclaimer: This list was put together by students. Unless specified elsewhere, none of the programs listed are associated with ESW in any way, and ESW accepts no liability for their use. Additionally, ESW does not necessarily recommend the software listed over other existing software. This list is merely intended to empower students who would not otherwise have access to professional-level software.