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BigcapitalAccounting & InvoicingBigcapital is AGPL-licensed accounting software with a double-entry ledger, sales and purchase invoicing, inventory, multi-currency support, cash and accrual reporting, a REST API and Docker self-hosting. Cloud is listed as coming soon.Open sourceSelf-hosted
Ever GauzyERP & Business SuitesEver Gauzy is an AGPL-3.0 business management platform from Ever Co. that combines HR, time and activity tracking, CRM, invoicing, recruiting and project management, available as Docker images, desktop apps for Windows, macOS and Linux, and a cloud service.Open sourceSelf-hostedFreemium
FleetbaseERP & Business SuitesAGPL-3.0 logistics and supply chain platform from Singapore-based Fleetbase. Fleet-Ops dispatch and routing, Storefront commerce, Ledger billing, driver and customer apps, a REST API and extensions, self-hosted with Docker or on Fleetbase Cloud.Open sourceSelf-hostedFreemium
FlexpriceAccounting & InvoicingFlexprice meters usage events in real time and turns them into invoices for usage-based, credit-based and hybrid pricing, with entitlements, wallets, SDKs and Stripe and other integrations. Go backend, AGPLv3 open core, Flexprice Cloud or self-hosted.Open sourceSelf-hostedFreemium
Frappe BooksAccounting & InvoicingFrappe Books is AGPL accounting software from Frappe Technologies with invoicing, inventory, POS and financial reports. The Electron desktop app is archived; the supported version runs on a self-hosted Frappe site in the browser.Open sourceSelf-hosted
Invoice NinjaAccounting & InvoicingSource-available invoicing app for freelancers and small businesses: invoices, quotes, recurring billing, expenses, projects and time tracking, a client portal, REST API and apps, hosted or self-hosted.CommercialSelf-hostedFreemium
MeteroidAccounting & InvoicingMeteroid meters usage events and bills them with versioned plans, subscriptions, quotes, credits, invoices and e-invoicing. Rust backend on PostgreSQL, ClickHouse and Kafka, AGPL-3.0 open-source edition, Enterprise images and an EU-hosted cloud.Open sourceSelf-hostedFreemium
MiddayAccounting & InvoicingOpen-source finance app for freelancers and small teams with bank sync, invoicing, time tracking, receipt matching, a document vault and an AI assistant. The hosted service was wound down after Midday joined Ramp in 2026; the source stays public.Open sourceWeb platform
OdooERP & Business SuitesOdoo is a web-based suite of business apps from Odoo S.A. The LGPLv3 Community edition covers CRM, sales, invoicing, inventory, manufacturing, POS and website modules on PostgreSQL; Enterprise apps, Studio and hosting are sold per user.Open sourceSelf-hostedFreemium
PaymenterAccounting & InvoicingPaymenter is an MIT-licensed billing platform built for hosting providers. It handles products, recurring invoices, tickets and customer accounts, and provisions services through extensions such as Pterodactyl, Proxmox and Stripe.Open sourceSelf-hostedFreemium
solidtimeProject Managementsolidtime is an AGPL-3.0 time tracker built on Laravel with timer, calendar and timesheet, billable rates, goals, reports, invoicing, desktop apps and Toggl, Clockify or Harvest import, as cloud or self-hosted.Open sourceSelf-hostedFreemium