Based on our record, Platforma seems to be more popular. It has been mentiond 1 time since March 2021. 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.
There are some decent starters in the community (including some really great OS-native resources), but another option is purchase something like Platforma if you're looking to make interactive wireframes - https://platforma.ws/. Source: over 2 years ago
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
UI Flow Cards - Construct web pages with ease, using cards
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Wannathis - 3d illustrations and freebies
Invision - Prototyping and collaboration for design teams
The User Interview Exchange - Give a user interview, get a user interview - It's all free