Tools like Blender (for 3D mockups) and GIMP (for photo editing) are 100% free forever and rival paid software if you take the time to learn them.
To get the absolute most out of the "free" internet ecosystem without falling into spam traps, follow these rules of thumb: free fakings free
Canva acquired Smartmockups to give users a massive library of free, high-quality product simulations. Upload your image. Place it on a digital smartphone, billboard, or t-shirt. Download the high-resolution result for free. Tools like Blender (for 3D mockups) and GIMP
Software developers frequently need to populate their databases with massive amounts of realistic-looking data to test their systems. You cannot use real user data due to privacy laws, which is where "fake data" generators come in. The Best Free Data Generators: Place it on a digital smartphone, billboard, or t-shirt
Always check the licensing on "free" mockup sites. Some are free for personal use but require a license for commercial client work.