There's a couple of fluff rules about jumping deliberately, as well as rolling Jump/Tumble checks.

So, basically, the most damage you can take is 120. No matter how high you jump/fall from.

Realistic? Oh hell no.

However, i think that that rule MIGHT be "optional", additionaly, i think theres an "optional" rule to the option, that you modify that 50 based on...something, so that everyone isn't laying down con saves every time a level 20 wizard drops a maximized fireball.

Not in the classless variants, of which BESM d20, which he specifically mentioned, is one. [or, rather, can be one -- it has options for both classes and non-class play.]

There have been several "Grim and gritty" d20 variants in the last year or so, as well -- Thieves' World from Green Ronin, A Game of Thrones from GoO.

True. However, classless in d20 is purely optional. I've yet to actually see anyone use it.

Now, I've had GMs make up a class on the fly based on a concept, but it's still class-limited then.

I play Eberron. Very nice setting, though not as good as Earthdawn.

Oh yeah i'm down with that bro, we found some rules on the net once that where immortal rules for WoD.

it was unbalanced but very good games.

his name is appropiate, we should just burn the member at the stake in town square...if not in front of Dante's Inferno.

Too be honest, I didn't mind d20 Star Wars. I used to swear by WEGs version, but then I ran a one-shot with d20 and my players really liked it. The key to it was to remember that there are no multi-class restrictions, and to use all the classes in combonations to make the character you wanted...

I don't think I could stomach a d20 version of SR though.... I can't imagine d20 classes doing any justice to the cyberpunk genre.

Just my 2cr.

To actually answer your question: It's a legit fully-licensed game, published by Wizards of the Coast. They released an original and a revised edition, and a fair number of sourcebooks, but they haven't released any new sourcebooks for well over a year now.

I played in a campaign for about 8 months or so and had a good time, but we messed around with the rules a lot to get the extremely cinematic feel that we wanted, and we outrighted ignored some rules after testing them out once, such as the starship combat rules.

That can only be done using the Monty Python and the Quest for the Holy Grail game system.

No, it's not a realistic game. Neither is Shadowrun. What SR is, compared to D&D, is frequently more lethal over a long term (although not as much when compared to low level D&D characters).

The OP didn't restrict himself to D&D though. He also mentioned d20 Modern. d20M is much more lethal than standard D&D. The massive damage threshold is equal to a character's Con, and a failed DC 15 Fort save sends him to -1.

d20M is very adjustable in terms of lethality. The frequent house and 3rd-party rules I see are mas dmg threshold of 10, or Fort DC of 10 + damage, 10 + 1/2 damage. The rule I'm using in my classless SR/d20M-based conversion is MDT of 10 + Con mod + Size mod. Save DC is 10 + damage, and failure reduces you to -1d20 hit points. I'm also using an injury system hijacked from some OGL product. Blood and something or the other, maybe a Modern Disaptch.

The characters begin with hp=Con. They don't automatically gain new hit points unless their Con increases. If they want hit points, they have to spend XP on buying hit dice (raing from 500 xp to 2,000 xp). The conversion is based in large part on the OGL rules for Godlike. Of course, xp spent on hit dice is xp not spent on skills, feats, wealth, saves, etc.

In league with this, I'm using armor = damage conversion, with armor providing a random conversion amount with each hit.

I hope to start playtesting this weekend if my back heals up some. I expect it to be as lethal, if not more so, than the actual SR system. So far, I'm pleased with the base d20 system. It's certainly one of the easier systems to fiddle with.

untrue. d20 incorporates subdual damage, which is counted up from 0 and compared to your current hp. when subdual dmg > hp, you go down. it is, in that way, better than SR, since subdual damage and hp combine to decide when you go down, rather than allowing you to run around at the equivalent of 9 boxes of each. i agree that the lack of wound mods is rankling, though.

rather than converting d20's magic system, you'd probably want to convert the psionic system (or, if you have Unearthed Arcana, i believe there's a magic points system that works similar to psionics' power points).

i'll note that while this is certainly an encouraged style of D&D game, the game itself is just as open as SR.

Also d20 Modern also has it's overdamage rule much harsher than D&D. Basically any damage greater than your Con score in a single attack and you must make a saving throw or be instantly killed, no matter your hit points.