Kilelit, also called Ki, is a Blender addon built around a Render Panel where render execution takes place. The render references whatever mode you have enabled, so with Render History turned on it renders and updates a previewer. File handling occurs dynamically in the background, and when Render History is active you specify the directory where renders are saved. You can open that folder from the addon or empty the history collection after a confirmation prompt.
The Render Selected Only mode renders just what is selected in the viewport, using either Holdout Unselected, which cuts out unselected meshes via Holdout visibility, or Invisible Unselected, which disables their camera visibility. A Render Shadow Catcher option renders the selected object as a shadow catcher and turns on Blender's Fast GI approximation. Animation mode works alongside Render Selected Only, ignoring Render History and letting you render separate passes to composite in post.
A UI Lock in the preferences is surfaced for easy access and enables automatically while rendering with Render History. A Render Sampling panel gathers render setting parameters, and Documentation covers the current version and bug fixes. Kilelit is intended for Cycles, Eevee, and viewport use.