postimage
PostImages.org is a free image hosting company with hotlink support. Upload images for Facebook, Twitter, message boards, and blogs.

ImageShack
ImageShack offers image hosting, free photo sharing and video sharing. Upload your photos, host your videos, and share them with friends and family.

Google Photos
Google Photos is a great place to store your photos. Uploading photos doesn't affect resolution or quality. Good for long-term storage and album collaboration. Has a powerful automatic backup feature.

Pinterest
Pinterestis is a popular free image-hosting site for bloggers and photography enthusiasts. It is a photo networking site where you can host and share your images.

imagekit.io
ImageKit is a fast, secure, and reliable image hosting service. Share images instantly without any hassle.

FreeImgHost
FreeImgHost is a fast image hosting service. You can upload images anonymously. Create albums, get direct links, Markdown, BBCode, and HTML thumbnails.