Tyranobuilder - http://tyranobuilder.com/:Start making your own multi-platform video games right NOW, even if you know nothing about game programming or scripting! TyranoBuilder’s suite of intuitive drag-and-drop tools allows you to create high quality visual novels with speed and ease, and bring your creativity visions to reality! Games made with TyranoBuilder can be easily exported to PC, Mac, browsers, or converted* for use on smart devices, then distributed on physical media or via online sites such as the Steam Store, the Apple App Store or Google Play! (*Requires free third party software. See the TyranoBuilder Tutorial for details.) Moreover, TyranoBuilder requires Absolutely ZERO licensing fees or royalties, so all revenue generated by sales of your games are YOURS!

Ren'Py - www.renpy.org is a visual novel anime engine, used by thousands of creators from around the world, that helps you use words, images, and sounds to tell interactive stories that run on computers and mobile devices. These can be both visual novels and life simulation games. The easy to learn script language allows anyone to efficiently write large visual novels, while its Python scripting is enough for complex simulation games. Ren'Py is open source and free for commercial use.

Geneware - https://www.animegames.app/manual/geneware.htm:Very interesting concept about source code of the software Fight! Pussycat Heart.  Creator email wrr @ 3dcgx.com for more questions.