1.
HiveMQ – The Most Trusted MQTT platform to Transform Your Business
https://www.hivem
.com/

HiveMQ is the proven enterprise MQTT platform designed to connect, communicate, and control IoT data under real-world stress. Learn more.

2.
EMQX: The World's #1 Open Source Distributed MQTT Broker
https://www.emq
.io/

EMQX: The most scalable MQTT Broker for IoT. Connect 100M+ IoT devices in 1 cluster at 1ms latency. Move and process millions of MQTT messages per second.

4.
ThingsBoard — Open-source IoT (Internet of Things) Platform
http://thingsboar
.io/

ThingsBoard is an open-source IoT ❰Internet of Things❱ platform for device management ᐉ data collection ᐉ processing and visualization for your IoT projects

5.
Blynk: a low-code IoT software platform for businesses and developers
https://blyn
.io/

Build custom mobile apps and web dashboards with our drag-and-drop app builder. Get a complete, hardware agnostic IoT solution with an integrated back-end infrastructure, private cloud, device management and user management tools. Publish your own app in AppStore and Google Play with our white-label option.

6.
API Management Platform & API Gateway | Tyk.io
https://ty
.io/

Our API Management platform is fast, scalable, modern. Including an open source API Gateway, Analytics, Dev Portal and Dashboard.