RLTK (Master) now has a nicer builder-based initialization format.
Version 0.6.1 of RLTK is live.
My Rust Roguelike Toolkit (RLTK_RS) now has an experimental branch that supports multiple back-ends (or a minimal one if you just want the helpers and no rendering). The default OpenGL (native and web assembly), Curses (for running in a traditional console, or PDCurses on Windows), and Amethyst - the Rust game engine that can provide both Vulkan and Metal native support.
I just merged in version 0.5.0 of the rltk_rs project (the back-end used for the roguelike tutorial).