Mockup Mark might be a bit more popular than Briefbox. We know about 1 link to it since March 2021 and only 1 link to Briefbox. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
This is a free exercise briefing from briefbox.me:. Source: over 2 years ago
Https://mockupmark.com/ has some great free options. Source: almost 2 years ago
GoodBrief - A random generator for design briefs.
Placeit Apparel - Photorealistic apparel and t-shirt mockups in seconds.
Uxcel - The easiest way to learn UX/UI design
Placeit - Generate realistic product shots in seconds
FakeClients - Practise logo design using random generated client briefs
Placeit Unlimited - 12,000 smart design templates for $29