MittensEdit is a free AA / S_JIS Art editor developed by killsushi!Basque9Dpk for the Channel4 (4-ch.net) community. Licensed under GPLv3. Source code may be found here.
※ AA Editor requires that canvas and webfonts be enabled for correct dot width calculations. Editor will not function for characters outside the Saitamaar webfont. Do not use tab characters for spacing.