Inform 7 source code, at first glance, looks like plain English. It makes you start to wonder whether Inform 7 is actually an LLM and not a compiler. Then as you look at more code, you quickly start to see the structure of the language, and realize that it is indeed a programming language merely structured to look like English at first glance. But it's very cool that you can do things like this (example from the Inform 7 documentation):

    Definition: a room is neighboring if the number of moves from it to the location is 1.
    Every turn:
        if a random chance of 1 in 2 succeeds:
                    let current location be the location of the lurking critter;
                    let next location be a random room which is adjacent to the current location;
                    if the lurking critter is visible:
                        say "The critter [one of]slouches[or]slithers[or]shambles[or]lurches[at random] away.";
                    move the lurking critter to next location;
                    if the lurking critter is visible:
                            say "A critter [one of]oozes[or]staggers[or]ambles[or]creeps[at random] into the room.";
        [Whether or not the critter has moved, we need to adjust the sword-glow, because the player may have moved.]
        if the lurking critter is in the location:
                  adjust sword-glow to glowing brightly;
        otherwise if the lurking critter is in a neighboring room:
                  adjust sword-glow to glowing faintly;
        otherwise:
                  adjust sword-glow to glowless.

This snippet omits the definition of "the lurking critter" (a standard NPC) and the sword (a standard object with a custom defined method called "adjust sword-glow to"), but it should give you a good idea of what Inform 7 source code looks like. (Inform 6 looked much more like a traditional programming language).