The games Science Girls, Magical Diary, Date Warp, Long Live The Queen, and Black Closet are copyrighted by Spiky Caterpillar and Hanako Games. Cute Knight Kingdom is copyright Hanako Games. Feel free to redistribute the demos; please do NOT redistribute the full versions.
Other games may be owned by other people - check the individual game's credits to see who.
While our games are not free software, they do make use of free software. In particular, we use the Ren'Py visual novel engine. The full details and licenses for the libraries used are included with each of our games. (I'm not listing them all here because the libraries vary from game to game.)
The source code for the libraries Ren'Py uses is available in renpy-deps-6.10.1.tar.bz2. The easiest way to get started writing your own Ren'Py games, though, is probably to download a binary Ren'Py distribution from renpy.org.
The Cute Knight Kingdom port and Spiky Caterpillar's Python GM Runtime both use SDL_gfx 2.0.20 (LGPL) and euclid.py (LGPL). You can get the source for SDL_gfx in SDL_gfx-2.0.20.tar.gz or the latest version of SDL_gfx from the developer's site at ferzkopp.net.