Pocket Application Maker. Combination of a rapid GUI generator and a flexible "text generator/commander" to handle both design and logic of an application simply from a text file. All with SQL capability (sqlite integrated).
Open RPG Maker is a free and open source clone of features from the RPG Maker series (i.e. rpgmaker200, rpgmaker2003, rpgmakerxp), as well as many other features. All of the data files are in XML format and are easily editable with any text editor.