Open Source Field Service Software
Field service software has to hold one thread together across very different places: the dispatcher assigning a job, the technician on-site doing the work, the parts pulled from stock, and the invoice that follows. When that thread breaks, work gets done but never billed, or billed for the wrong parts. That is why so much open source field service management is built as an extension of an ERP you already run, where scheduling, inventory, and accounting share a single database instead of syncing across separate tools. Self-hosting keeps customer addresses, equipment history, and proof-of-service records on infrastructure you control, which matters because those records resurface later in warranty claims, billing disputes, and recurring maintenance contracts long after a job is closed.
OCA Field Service
Odoo modules for field service management: locations, workers, orders, routes, and billing
Beveren FSM
Field service management app for ERPNext covering requests, scheduling, and invoicing
Open Field Scheduling
Self-hosted field service scheduling for jobs, customers, dispatch, and invoicing
Our picks
A short list, split by whether field service should ride on an ERP you already run or stand on its own.
Best if you already run Odoo: OCA Field Service OCA Field Service is a collection of Odoo add-ons maintained by the Odoo Community Association, covering service locations, workers, and orders plus modules for territories, routes, equipment, stock, timesheets, recurring orders, and agreements. Because it lives inside Odoo, scheduling and parts consumption flow straight into inventory and invoicing, and service locations even plot on an OpenStreetMap map. It suits repair and maintenance businesses already committed to Odoo.
Field service for ERPNext shops: Beveren FSM Beveren FSM adds a full service lifecycle to ERPNext: operators log a request with issue, location, and priority, an optional quotation covers labor, travel, and parts, and approved requests become service orders that are scheduled to technicians. Technicians start and stop work, consume parts from stock, and the completed order is closed and invoiced, all traceable on the Frappe backend. It runs via bench or Frappe Cloud.
Standalone dispatch for a single trade: Open Field Scheduling Open Field Scheduling is a self-contained scheduling and business app for trades like HVAC, plumbing, cleaning, and landscaping, running from one local SQLite file with no cloud services. It offers a weekly calendar with color-coded technicians, job priority and status, customer service history, materials tracking, per-job checklists, and invoicing from completed jobs. Service types and pricing are configurable, and a REST API backs the interface.
Deciding where field service should actually live
The first fork is architectural: do you bolt field service onto an ERP you already operate, or run a standalone app? Two of the three options here are ERP extensions. OCA Field Service is a set of Odoo add-ons, so scheduling, stock, timesheets, and invoicing all live inside Odoo and share its data, and Beveren FSM does the same for ERPNext, carrying a job from request and optional quotation through service order to a final invoice on the Frappe backend. If you already run Odoo or ERPNext, that shared database removes an entire class of sync problems. If you do not, standing up a full ERP just to schedule technicians is a heavy commitment.
For a team without an ERP, a self-contained tool is the lighter path. Open Field Scheduling runs from a single SQLite file with no cloud services required, offering a weekly dispatch calendar with color-coded technicians, per-job checklists, materials tracking, and invoicing from completed jobs, and its service types are configurable enough to fit trades from HVAC to landscaping. Match the data model to how you actually work: a repair business needs equipment history and repeat visits, which OCA covers through its equipment and recurring-order modules, while a scheduling-first crew may only need the calendar, customer history, and a clean invoice.
This is a small, deliberately curated set rather than a broad market, so weigh the exit path early. Field service records become evidence in billing and warranty disputes long after a job closes, so confirm you can export work orders, parts usage, and customer approvals in a usable form. All three keep data in ordinary relational databases you can back up and read directly - a single SQLite file for Open Field Scheduling, and the host platform's own database for the Odoo and ERPNext modules.
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Frequently asked questions
Should field service software be part of my ERP or a separate app?+
It depends on what you already run. If Odoo or ERPNext is in place, OCA Field Service and Beveren FSM extend it so dispatch, parts, and invoicing share one database and one login. If you have no ERP, Open Field Scheduling is a standalone app on a single SQLite file, which is far lighter than adopting a full ERP just to schedule technicians and bill jobs.
Will these work offline for a technician with no signal?+
Be careful here, because none of the three advertises true offline field editing. OCA Field Service and Beveren FSM are web apps served from your ERP, and Open Field Scheduling, while it runs from a local SQLite database, is still a served application that expects a connection. Test the exact behavior in airplane mode before you rely on it in basements, rooftops, or dead zones.
How do parts and inventory get tracked against a job?+
The strongest setups tie parts to stock automatically. OCA Field Service integrates Odoo's stock module so consumed parts move inventory without re-keying, and Beveren FSM lets technicians consume spare parts from stock as they work an appointment. Open Field Scheduling offers per-job materials tracking. The test that matters is whether using a part in the field updates inventory in a way purchasing and accounting can trust.
Can these handle recurring maintenance contracts, not just one-off jobs?+
OCA Field Service is the best fit for that, since its module set includes recurring orders and service agreements alongside equipment history, which is what maintenance contracts and warranty work depend on. Beveren FSM follows a request-to-invoice lifecycle aimed more at discrete service orders, and Open Field Scheduling centers on scheduling and dispatch, so confirm recurring visits fit your workflow before committing.
Which trades or businesses do these actually fit?+
Open Field Scheduling ships configurable service types and pricing aimed at pest control, HVAC, plumbing, cleaning, and landscaping, so a small trade crew can shape it to their work. OCA Field Service and Beveren FSM fit companies already committed to Odoo or ERPNext respectively, where field service is one more module on a platform that already runs sales, stock, and accounting.
How does invoicing flow from a completed job?+
The shared-database designs make this cleanest. In Beveren FSM, closing a completed service order generates the invoice directly, and OCA Field Service links invoices to orders inside Odoo so labor and parts carry through to accounting. Open Field Scheduling invoices from completed jobs within its own app. Verify that labor codes and parts land where finance expects them rather than needing manual reconciliation.
What proof-of-service records should the system preserve?+
The valuable record is rarely just the closed work order. It is the technician notes, parts used, checklist results, and activity log tied to the job. Open Field Scheduling keeps per-job checklists and activity logs, while the ERP-based tools attach the work to orders, timesheets, and invoices. Make sure these details export with the job, because they become the evidence in chargebacks, warranty claims, and safety reviews.