Bundle games and games on high discount

I think this is what u are looking for Here

https://steamdb.info/sales/ : this will let you see all the games currently discounted on Steam, and you can order them by discount
http://www.epicbundle.com/bundle-countdown : this will show you all current bundles
http://isthereanydeal.com/ : you can get many infos on the prices of games, they list many official stores, you can see the lowest historical prices of the games and the bundles they have been in. You can also get mail alerts when a game you want gets under a certain price/discount

Not sure if you are looking for a list on steamgifts or a general list on deals. For the second, this reddit is pretty essential: https://www.reddit.com/r/GameDeals/new/