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Thingspeak
ThingSpeak is an open source “Internet of Things” application and API to store and retrieve data from things using HTTP over the Internet or via a Local Area Network. With ThingSpeak, you can create sensor logging applications, location tracking applications, and a social network of things with status updates.
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Scout Monitoring
Rennaisance engineers rejoice! 1 gem 5 min to app monitoring. 5-minute onboarding. No sales team. Devs in the support channels. No DevOps team required. Get the free app insights every engineer deserves with Scout Monitoring.
I haven't got around to MQTT yet, but as an easy interim solution I recommend ThingSpeak https://thingspeak.com/ as you can set up an account for free and getting an ESP to send data to it is trivial. Plus you can access it via the web, or embed their graphs and dials into a webpage. The graphics are a bit meh though.
I use Adafruit IO. You can publish values via MQTT (or HTTP if you like) and view graphs etc on the website. https://io.adafruit.com/