Backend & APIs
filestack.com
File picker, transform, and deliver, free for 250 files, 500 transformations, and 3 GB bandwidth
npoint.io
JSON store with collaborative schema editing
redbooth.com
P2P file syncing, free for up to 2 users
kraken.io
Image optimization for website performance as a service, free plan up to 1 MB file size
otixo.com
Encrypt, share, copy, and move all your cloud storage files from one place. The basic plan provides unlimited file transfer with 250 MB max. file size and allows five encrypted files
nitropack.io
Accelerate your site's speed on autopilot with complete front-end optimization (caching, images and code optimization, CDN). Free for up to 5,000 pageviews/month
gumlet.com
Image and video hosting, processing and streaming via CDN. Provides generous free tier of 250 GB / month for videos and 30 GB / month for images
tinypng.com
API to compress and resize PNG and JPEG images, offers 500 compressions for free each month
placekitten.com
A quick and simple service for getting pictures of kittens for use as placeholders
kvstore.io
Key-value storage service. The free tier allows 100 keys, 1KB/key, 100 calls/hour
sirv.com
Smart Image CDN with on-the-fly image optimization and resizing. The free tier includes 500 MB of storage and 2 GB of bandwidth
pcloud.com
Cloud storage service. Up to 10 GB of free storage