The (free) ones I remember from the top of my head would be Pexels & Pixabay.

This is really cool. I have a site called Coverr.co for free stock video, so if you'd like to have more info about it, happy to help - you can also email me at team@coverr.co

Shopify also has a free stock photo website: https://burst.shopify.com/

I use shuterstock for work but am limited to only jpgs, the cost for tiff files is more than we are willing to spend on a weekly basis.

Wikimedia provides a list of several options. https://commons.wikimedia.org/wiki/Commons:Free_media_resources/Photography

Always Creative Commons - https://search.creativecommons.org

This site aggregates other stock sites for more than just photography resources, plenty listed there. http://allthefreestock.com

Ive the years I have used these options as an alternative to Shutterstock. My current go to would be Pexels and https://unsplash.com. Duotone is an interesting spin off of Unsplash in which it will allow users to create duotone images from unsplash files. https://duotone.shapefactory.co

Stock & misc collections; http://www.resplashed.comhttps://morguefile.comhttps://deathtothestockphoto.comhttps://freerangestock.comhttps://magdeleine.co/browse/https://visualhunt.comhttps://burst.shopify.comhttps://www.nypl.org/research/collections/digital-collections/public-domainhttp://coverr.cohttp://www.beachfrontbroll.com

I think Chrome will block these auto opening tabs. Did you check that?

Anyway, here's a list of stock photos: https://web3canvas.com/80-free-stock-photo-sites/

here you will find more references http://www.bluevertigo.com.ar - I use this since 2003 :)

*Should I list paid stock archive websites as well?

A check box or a option to select what type of license will be helpful, don't mix them.

*Should I include icons so you can search in multiple icon search engines?

Yes

Albumarium has some unique high-quality images as well

youworkforthem.com

Abi iconlar da aranabilse güzel olabilir ama bildiğim tek site https://thenounproject.com/ o da paralı ya da CC lisanslı atıfta bulunularak kullanılabilir.

Fakat önerebileceğim başka bir şey var animasyon süresi ilk yüklenmede uzun gibi geldi. Eklentiyi actıgım gibi type yapıp enter'a bastıgımda search ediyor sıkıntı yok ama eger kullanıcı sürekli değil de sadece yapacagı o arama icin bir siteden öneri almayı kapatmak ıstiyor olsa bütün animasyonun bitmesini beklemek zorunda kalacak.

Google animasyonların hızlı yapılmasını öneriyor https://material.io/guidelines/motion/duration-easing.html#duration-easing-common-durations burada common durationlar var özellikle dektop icin 150 - 200 ms arası öneriyor.