lumen
lightweight image serving
Basically, a trimmed down version of reticulum without the distributed aspect. Sometimes it's enough to essentially have a single node backed by S3.
The public API (upload images and retrieve scaled images by URL) is fully compatible with reticulum (so existing client code can just switch). But all images are stored in a single S3 bucket. For low amounts of traffic, as long as you are happy with S3's durability guarantees, this could be perfectly fine for you, and it's simpler to setup and run than a full reticulum cluster (which was originally designed and optimzed for running on commodity hardware and drives).