Rules for this variant. Offers play-by-email.

This variation adds two jokers to the deck which at as wild cards. Either joker can be played as being of higher rank than the Ace of any suit, or lower than the 2, at the player's discretion.

Game overview from Wikipedia.

The rules as played at the annual Cartier Oh Hell Championship in London, England.

Pagat.com provides rules, variants, score sheets, related games, and links.

Al Okenuff's rules where you lose points if you do not make your bid.

Offers software for tracking statistics, and the results for a group of regular players.

This variant plays hand size from 4 to 13 cards, high bidder names trump, point loss for missing your bid, and even bids are not allowed.

This variation starts with the maximum hand size, goes down to one and then back up. The high bidder chooses trump, and even bids are not allowed.

In this variation of Oh Hell, extra hands are played with one card and with the maximum cards, even bids are disallowed, and points are lost for missed bids.

Pratt and Whitney East Hartford Cafeteria Card Players' Club variation.

Known as "Stich Ansagen" in Central Europe, which roughly translates to "Predict Tricks" or "Call the Trick". Play is from 1 to 13 to 1 card hands and even bidding is allowed.