Sketchboard.io might be a bit more popular than UI Jar. We know about 1 link to it since March 2021 and only 1 link to UI Jar. 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.
UI Jar: This is one of the better ones for “general” category. Check it out yourself. It has some extensive filters. Source: 12 months ago
Miro or sketchboard have pretty decent tools for designing your digital whiteboard and creating flowcharts. While still being quite easy to use (and therefore fast to get your ideas out). Source: about 3 years ago
UI Movement - The best UI design inspiration, daily
Limnu - Sketch, share and collaborate with your team
Design Hunt - Curated design inspiration for everyone
RealtimeBoard - RealtimeBoard is an online collaboration software created as a team collaboration and online brainstorming tool. It's super easy to use & free!
Muzli - UI/UX and Design Inspiration Chrome Extension
Draw.Chat - Anonymous real-time whiteboard with text and video chat.