humble bundle gift link

you can send it via adding winner via steam or if you can extract code from humble bundle you can make a key GA

HB links should work if they're in the correct format (haven't been claimed).
Alternatively you can claim the link, go to the page and click on Redeem. HB will then display the CD key which you can give away as normally.
(HB doesn't link directly with Steam anymore so you should no longer be in risk of accidentally activating the key during redemption.)

thanks guys, I figured it out

Just to make sure, since it's not clear, unclaimed Humble gift links are recognized on SG just as if they were Steam keys. Either when you're creating a giveaway or adding a key later, you can just paste the gift link in the same place you would normally paste a Steam key.

This only applies to Humble, and not the gift links from any other site like IndieGala, etc.

Just a lttle something to add: SteamGifts correctly recognizes Gift Links from Humble Bundle so they can be added as "Keys" in the creation of a giveaway without any issues, but is not the same for Gift Links from Indie Gala. Those can only sent via Steam Chat or via e-mail, unfortunately.