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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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flyimg
Cloud-native application that resizes and crops images on the fly, delivering optimized images in formats such as AVIF, WebP, MozJPEG, or PNG using ImageMagick, with an efficient caching system.
I wrote https://github.com/willnorris/imageproxy for exactly this purpose about 10 years ago. It's just been a personal project, but handful of folks have used it over the years. As mentioned below, imgproxy.net is the other pretty popular option, also written in go. Notably, it's backed by Evil Martians (makers of postcss and a bunch of other things), so is a bit more robust, and has gotten a lot more real-world usage and large scales.
They use libvips for image processing, so is a lot more performant. For my imageproxy project, I opted to stick to pure Go libraries, so it's a bit slower, and doesn't currently support webp output. But I've found sticking to go libraries makes it easier to build and deploy; for example, I currently use it on my personal website as a plugin compiled directly into my Caddy webserver.
There are many, one of them https://github.com/flyimg/flyimg