Apps with 'Level editor' feature
DeleD is a 3D modeler and level-editor combined into one. It focuses at game development and is specifically designed to create static objects/worlds.
AppGameKit Studio is a fully featured cross-platform game development tool set that runs on Windows, Linux and MacOS.
This is the most amazing SMB editor yet. Not only does it have full editing capabilities, it has an emulator built in so you can test the game from the exact point you’re editing.
HiberWorld is a website that allows you to make and play 3D levels for speedrunning.
Happy Wheels is a ragdoll physics-based, browser game created by Jim Bonacci.
Grome is a game level authoring tool used by professional game developers and companies from 3D simulation industry.
R.U.B.E stands for Really Useful Box2D Editor. This editor allows you to graphically manipulate a Box2D world and save it to a file.
IDE for HTML5 game creation with Phaser featuring WYSIWYG visual design tools with code generation and more.
Create and publish XNA games for Xbox 360, Windows Phone 7, and Windows!No screenshots yet
A level editor for the DS game New Super Mario Bros, originally made by Treeki and now maintained by Dirbaio. Aka NSMBe.Features:No screenshots yet
Editor for Super Mario 64 DS. Aka SM64DSeFeatures:* Model, texture and animation importer/exporter with support for .obj and .dae
New Super Mario Bros. 2 level and tileset editor, coded with C++ and Qt5.No screenshots yet
KGoldrunner is an action game where the hero runs through a maze, climbs stairs, dig holes and dodges enemies in order to collect all the gold nuggets and escape to the next level.