DeleD is a 3D modeler and level-editor combined into one. It focuses at game development and is specifically designed to create static scenes.
NOTE: a new webbased version called Figuro is available at https://www.figuro.io ! It runs in the browser, has similar capabilities and is generally easier to use.
Related project at https://sourceforge.net/projects/deled-plugins/, featuring DeleD plugins.
A Lazarus port is available in the repository as well.
Check out the official DeleD website...