I use smartmockups.com. Just upload your PNG with transparent background. Source: 9 months ago

By the way, there are sites with free mockup images, https://smartmockups.com/ is one example. Source: about 1 year ago

Have you also googled stuff like this https://smartmockups.com/ ? haven't used it (i have photoshop ;) ). Source: over 1 year ago

Smartmockups.com — Create product mockups, 200 free mockups. - Source: dev.to / over 1 year ago

Well, this exact pillow is from redbubble.com . It's a print-on-demand shop that deals with home textiles, clothing, accessories, mugs, and other products. There are many similar online shops. Artists are using them not just to sell their prints there, but also for getting nice visual examples with their art (mockups). If a shop sounds too complicated for you, you can simply find some digital mockups (of different... Source: almost 2 years ago

Startup Stash • Tools and resources for entrepreneurs Integrations Directory • Directory of integrations for your no-code product. One Page Love • Find inspiration from one-page websites Do Things That Don’t Scale • Collection of unscalable startup hacks NoCodeList • Software for your projects Page Flows • User design flow inspiration Stackshare • Find software for your projects and business Side Hustle... Source: over 1 year ago

One of the things you will need to think about at this stage of the project lifecycle is the tools you will use to power your business. Startup Stash is a directory of tools (both free and paid-for) that you can utilize at the start of your business journey. In addition to that check our directory of tools, that we’ve checked and used during our startup journey. - Source: dev.to / about 2 years ago

"Startup Stash - A Curated Directory of Tools and Resources for Your Startup" https://startupstash.com. Source: almost 3 years ago

Also useful (but not a book): https://startupstash.com/. Source: about 3 years ago