Steamgifts.com has very good list for the latest game bundles, humble bundle ones as well. It's especially good if you are in some other regions. There's always some region restriction info. Source: about 2 years ago

There is also steamgifts.com if you care for more involved giving away steam stuff. Source: about 2 years ago

When I get games in a bundle a) which I already own or b) which I am not interested in I create a giveaway on https://steamgifts.com or on https://indiegala.com. Source: over 2 years ago

You can create gifts here: https://steamgifts.com. Source: over 2 years ago

Check out steamgifts.com for more of the same feels. Source: over 2 years ago

Asking if you should buy a game now or wait for a sale isn't allowed, asking when a game will go on sale is not allowed, asking how big of a discount a game might get is not allowed. Use SteamDB to look at sale histories on games. Source: 6 months ago

Here's how to cure you from your buying habit, checkout https://steamdb.info/, check the price history of the game you're thinking of getting. Most likely it's on sale once every odd month, and discount percentages are only ever increasing over time. So really you can just buy it when you think you have time to play it soon. Source: 6 months ago

Correct, it's trending on https://steamdb.info/ if you look at the panel, some games will show zero players. But OP is wrong, other games are trending too. Source: 6 months ago

Asking if you should buy a game now or wait for a sale isn't allowed & asking when a game will go on sale is not allowed. Use SteamDB to look at sale histories on games. Source: 6 months ago

You can use the Steam console to download older versions as described here. You can get the depot and manifest IDs from SteamDB. Source: 6 months ago