Ninja IDE: written in Python for Pythonists
It is FOSS (GPLv3). The license information was a wee bit hard to find (Wayyy down on the about page <a href="http://ninja-ide.org/about/" rel="nofollow">http://ninja-ide.org/about/</a>) and I first thought it was some frankenstein freemuim product where you had to apply for a free license if you were an OSS devel (like PyCharm) etc. etc.<p>I gave it a whirl:<p>1. Snappy, which is nice, since PyCharm can be sluggish on my Mac
2. No VCS integration
3. By default very strict code checking is turned on, which turns my (functional) code into a sea of underlines, which is not so pretty<p>It looks to be an interesting start, but it will need VCS integration before it looks suitable as a PyCharm replacement.<p>I didn't look in detail at code completion/code assist, which PyCharm does very well.