[kfcm]

There are desktop-based farm management solutions out there from companies like Ag Leader, John Deere, Trimble/Farm Works, and others. Some of these interact with smartphones or tablets (sync on LAN, maybe Internet).

Many of these companies are also moving towards cloud/SaaS-based solutions and developing private networks to facilitate real-time data ingestion from their equipment (tractors, combines, planters, sprayers, irrigation systems, wagons, etc).

So there are local solutions, and they're installs like any other software.