The best replacement for scaleform is ngui.

The best alternatives to scaleform are rated as following:
★★★★★  ngui

Your alternative for scaleform is not listed? Suggest!
Speaking about scaleform, one probably shouldn't forget about udk.

Other search terms related to scaleform and their ratings are:
★★★★★ udk
You have in mind a companion for scaleform and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of scaleform in all years. Click on graph for more.
scaleform
ngui