Animation: Koikatsu Chara Studio by Illusion. Available on STEAM as Koikatsu Party - requires a 1gb patch after installation to unlock adult content in the game and studio. MOD Downloads exceed 2gb of extra content once that has been installed, adding characters, items, maps, clothing, etc to the collection of assets. Note that Illusion permits use of images and animations, but not direct sale of them, which is why we offer the game available free of charge to everyone, only accepting "Name your own price" donations for our time and work rather than the animations and renders.
Coding: RenPy Python coding utility. https://www.renpy.org/
Image Editing: Photoshop / Corel PaintShop Pro for custom textures, original artwork, and to polish certain renders.
Microsoft Word / Google Docs for writing the script.
And... an average of 60-100 hours per week (each of us) writing, rendering, animating, coding, compiling, and testing everything.
If you enjoy the quality and content of our work, please consider subscribing or donating (by clicking "Download Now" and inputting a dollar amount in the above "Name your own price") at your discretion then completing the transaction... All optional support is very thankfully welcome.