Strategy and boardgames
The excellent Neptune's Pride is a web-based board game, and long one of our favourites. Essentially, it's How To End A Friendship In One Easy Strategy Game. The action is simple: move ships to conquer planets, then build an economy on those planets. The glacial pace ensures that as you set nefarious plans in motion against your best friend, they have hours to marvel at your cruelty.
Settlers of Catan
A classic boardgame brought into your browser. Catan helped usher in the golden age of boardgames as it grew more and more popular outside of Europe. If you've never played Catan, here's a free opportunity to hate your friends because they won't give you any fucking grain.
The premier deckbuilding card game, with the base set freely available to play with online. Dominion is an incredibly malleable card game with loads of expansions; victory is in assembling a deck of cards that work well together around a single strategy, whether that's loading down your opponents with trash cards or loading up your own deck with victory points. Annual silver and gold subscriptions are available to unlock the dozen plus expansions.
A tactical tabletop game from the co-creator of Irrational games and minds that worked on Magic: the Gathering. The collectible cards, in this case, are units you place on a board to take down bad card units. Also, cards are items and movement abilities. There are a lot of cards in this game. It's a good time—if you like CCGs or tactical card games, it's worth giving a shot. Also, microtransactions are made in the form of buying digital pizza, which is adorable.
Through the Ages: A Story of Civilization
A civilization-building game that's been online for years and is still getting updated. First released in 2006, Through the Ages is still one of the most highly rated games on BoardGameGeek. It's long and complex, so instead of spending hours around the board, you can spread those games across weeks or months. Race your friends to develop the best technology and wonder as the tortoise, not the hare.