Designers and developers can finally work in unison to build beautifully designed software experiences that truly scale up.
Penpot is the Open-Source Design & Prototyping Tool for Product Teams.
If you have worked with Adobe XD or similar software, then it performs the same functions.
I haven't tested it very thoroughly, but I can tell you that it works very well and is open-source and free.
I haven't seen anything about Bootstrap in the library of bookstores and templates, but there are quite a few in other areas with a pretty good design.
You can test it on the official webpage.
See these videos from the official youtube channel:
