I’ve developed an online Sass Editor. I hope it helpful for your development job.
It uses libsass 3.3.1 to compile your Sass code.
The code editor was powered by Ace Editor projects. It has some features for you such as auto-indent, syntax highlight, find and replace with regular expression, but it still lack auto-complete feature.
Sass Editor quite simple, type your Sass in the left editor then click Compile, the CSS output will be in the right editor. Sass Editor will also auto-saves your work.
Give it a try and please send me your feedback.
Merry Christmas!