First of all, "official website" link is wrong. I wanted to update it but there are already pending changes.

Correct link is: http://pencil.evolus.vn/

Order of events:

1. Evolus creates and updates a great tool up to version 2.0.5.
2. Development seems to stall.
3. Another chap forks and continues development using the same name and continuing version numbers: https://github.com/prikhi/pencil
4. This chap (as of this writing) hasn't updated it in 4 months.
5. Evolus introduces new version 3.0 still in beta and puts their code in github as well (link on their site)

Chap that forked should have changed the name and restarted version numbers not to confuse anyone.

I've tested 3.0 beta 2 and it works well in portable mode (installs in user local data) and doesn't need admin access. Save, open, export functionality works well even with multiple pages. You can't copy/paste out of it as it uses own XML data format. To integrate to other tools you must export (to PNG). I use it for quick sketches. When necessity calls for quality and precise drawings, I use LibreOffice Draw and GIMP.

Few bad things about 3.0 beta 2 is that install is super silent and quick because it doesn't meed permissions, so there is no uninstaller. In local user folder program/data is stored in ".pencil", "AppData\Local\Pencil" and "AppData\Roaming\Pencil". Shortcuts to be manually deleted as well.

[Edited by nikolakovaevi, July 15]

Free and open source, save any group of objects as a template, link together objects and screens to create quick wireframe prototypes, and it has an open source model for icon sets/UI elements. What's not to love.

Does pencil evolus support right to left languages?! Can we change the direction of the shapes, tables to be from right to left?!