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
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Freeplane - Freeplane is a powerful and free software for building mind maps.
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Invision - Prototyping and collaboration for design teams
SuperNotecard - Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.