For a service that offers global coverage and fast setup for RTK corrections in many markets, Point One has a mature precision location stack. That includes Polaris RTK for cm-level accuracy and global coverage, a GraphQL API for easy integration, and Atlas INS for real-time truth-level positioning. It's suited for robotics, autonomy, survey, construction and precision agriculture, with fast setup and integration, and support for a broad range of GNSS devices.
Another alternative is Trackunit, a SaaS-based IoT service geared for the construction industry. It doesn't offer RTK corrections directly, but it does offer a broad suite of fleet management software and telematics tools. That can help with efficiency, downtime reduction and data-driven decision making, which can be useful in conjunction with RTK corrections for better location accuracy.
For industries that use photogrammetry and mapping, PIX4D is a mature photogrammetry software suite. It doesn't offer RTK corrections, but it has a variety of products for capturing, processing and analyzing drone and camera imagery, creating maps and 3D models. That could be useful for applications where spatial data is important, such as surveying, architecture, engineering and precision agriculture.