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6 jobs · 18 apps

Best open source software for banks and fintech

For a bank or fintech team, a self-hosted stack starts with HyperSwitch for payment routing and billing, Bigcapital for accounting and Keycloak for identity and single sign-on.

Fintech teams use self-hosted software where they need control over data residency, audit trails and vendor risk. This stack covers payments and billing, ledgers, identity, secrets and monitoring.

None of these apps is a core banking system; they are building blocks around one.

Updated · data from GitHub, refreshed daily

Top picks

  1. Rank 1:

    HyperSwitch

    juspay/hyperswitch

    Payment switch to make payments fast, reliable and affordable. Connect with multiple payment processors and route traffic effortlessly, all with a single API integration.

    Active · last commit Oct 28, 2026

    Finance & BudgetingRustDocker

    Stands out for the most GitHub stars. HyperSwitch has 45,422 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 2,323 commits in the last year.

  2. Rank 2:

    Lago

    getlago/lago

    Metering and usage-based billing.

    Active · last commit Oct 27, 2026

    Accounting & InvoicingGoDocker

    Stands out for its Go codebase. Lago has 10,714 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 199 commits in the last year.

  3. Rank 3:

    Kill Bill

    killbill/killbill

    Subscription billing & payments platform. Have access to real-time analytics and financial reports.

    Active · last commit Oct 27, 2026

    Accounting & InvoicingJavaDocker

    Stands out for a permissive Apache-2.0 license. Kill Bill has 5,824 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 220 commits in the last year.

At a glance

Open source software for banks and fintech compared

Picked by hand for each job from apps whose own description or topics match it, in curated order inside each section, with GitHub data from October 2026; an app appears only once.

Top 10 picks compared, data as of Oct 28, 2026
AppStands out forLicenseGitHub starsCommits (12 mo)Last commitDocker image
HyperSwitchthe most GitHub starsApache-2.045,4222,323Oct 28, 2026Yes
Lagoits Go codebaseAGPL-3.010,714199Oct 27, 2026Yes
Kill Billa permissive Apache-2.0 licenseApache-2.05,824220Oct 27, 2026Yes
Bigcapitalits TypeScript codebaseAGPL-3.03,9701,135Oct 27, 2026Yes
hledgerthe most commits in the last 12 months (2,368)GPL-3.04,7982,368Oct 28, 2026Yes
ERPNext–GPL-3.040,68710,424Oct 28, 2026Yes
Odoo–LGPL-3.055,38017,454Oct 28, 2026Yes
Keycloak–Apache-2.037,5633,232Oct 28, 2026Yes
ZITADEL–AGPL-3.015,457608Oct 28, 2026Yes
authentik–MIT26,1515,375Oct 28, 2026Yes

1 of 6 · 3 picks

Payments and billing

  1. 1

    HyperSwitch

    Payment switch to make payments fast, reliable and affordable. Connect with multiple payment processors and route traffic effortlessly, all with a single API integration.

    Stands out for the most GitHub stars. HyperSwitch has 45,422 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 2,323 commits in the last year.

  2. 2

    Lago

    Metering and usage-based billing.

    Stands out for its Go codebase. Lago has 10,714 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 199 commits in the last year.

  3. 3

    Kill Bill

    Subscription billing & payments platform. Have access to real-time analytics and financial reports.

    Stands out for a permissive Apache-2.0 license. Kill Bill has 5,824 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 220 commits in the last year.

2 of 6 · 4 picks

Accounting and ledgers

  1. 1

    Bigcapital

    Financial accounting and inventory management software for small to medium businesses.

    Stands out for its TypeScript codebase. Bigcapital has 3,970 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 1,135 commits in the last year; it replaces QuickBooks and Xero.

  2. 2

    hledger

    Plain text double-entry accounting with command-line, terminal and web interfaces, multi-currency support and CSV import.

    Stands out for the most commits in the last 12 months (2,368). hledger has 4,798 GitHub stars, uses the GPL-3.0 license, ships a Docker image and had 2,368 commits in the last year.

  3. 3

    ERPNext

    ERP system to help you run your business.

    ERPNext has 40,687 GitHub stars, uses the GPL-3.0 license, ships a Docker image and had 10,424 commits in the last year; it replaces NetSuite and SAP Business One.

  4. 4

    Odoo

    Free open source ERP system.

    Odoo has 55,380 GitHub stars, uses the LGPL-3.0 license, ships a Docker image and had 17,454 commits in the last year; it replaces NetSuite and SAP Business One.

3 of 6 · 3 picks

Identity and access

  1. 1

    Keycloak

    Open-source identity and access management with SSO, OIDC, SAML and user federation.

    Keycloak has 37,563 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 3,232 commits in the last year; it replaces Auth0 and Okta.

  2. 2

    ZITADEL

    Identity infrastructure with SSO, passkeys, multi-tenancy and audit trails, built in Go.

    ZITADEL has 15,457 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 608 commits in the last year; it replaces Auth0 and Okta.

  3. 3

    authentik

    Flexible identity provider and SSO platform with OAuth2, SAML, LDAP and proxy outposts.

    authentik has 26,151 GitHub stars, uses the MIT license, ships a Docker image and had 5,375 commits in the last year; it replaces Auth0 and Okta.

4 of 6 · 2 picks

Secrets and passwords

  1. 1

    Vaultwarden

    Lightweight Bitwarden server API implementation written in Rust.

    Vaultwarden has 69,807 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 217 commits in the last year; it replaces Bitwarden and 1Password.

  2. 2

    Passbolt

    Collaborative password manager.

    Passbolt has 6,191 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 2,041 commits in the last year; it replaces Bitwarden and 1Password.

5 of 6 · 4 picks

Monitoring and observability

  1. 1

    Grafana

    Dashboards and visualization for metrics, logs and traces from Prometheus, Loki and dozens of other sources.

    Grafana has 77,561 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 11,934 commits in the last year; it replaces Datadog and Grafana Cloud.

  2. 2

    Prometheus

    Metrics-based monitoring and alerting toolkit with a powerful query language, built for cloud-native systems.

    Prometheus has 66,825 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 2,795 commits in the last year; it replaces Datadog and Grafana Cloud.

  3. 3

    SigNoz

    Open-source observability platform for logs, metrics and traces built on OpenTelemetry.

    SigNoz has 32,473 GitHub stars, uses the MIT license, ships a Docker image and had 2,015 commits in the last year; it replaces Datadog and Grafana Cloud.

  4. 4

    Uptime Kuma

    Easy-to-use self-hosted uptime monitor with status pages and 90+ notification channels.

    Uptime Kuma has 93,018 GitHub stars, uses the MIT license, ships a Docker image and had 1,361 commits in the last year; it replaces Datadog and Uptime Robot.

6 of 6 · 2 picks

Reporting and BI

  1. 1

    Metabase

    Easy way for everyone in your company to ask questions and learn from data.

    Metabase has 49,881 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 7,206 commits in the last year; it replaces Metabase Cloud and Tableau.

  2. 2

    Superset

    Modern data exploration and visualization platform.

    Superset has 75,336 GitHub stars, uses the Apache-2.0 license and had 6,135 commits in the last year; it replaces Metabase Cloud and Tableau.

FAQ

Questions and answers

Still curious? Email info@appsgit.com.

Can banks use open source software?

Yes, and most already do inside their infrastructure. Regulators care about how software is governed, not whether it is open source: vendor risk, change control, access control and audit logs still apply to anything you self-host.

Is this a core banking platform?

No. The catalog has no core banking system; this page lists the payment, billing, ledger, identity and monitoring pieces that sit around one.

Is HyperSwitch free?

Yes. HyperSwitch is open-source software released under the Apache-2.0 license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.

Can I run this stack with Docker?

17 of the 18 apps here publish Docker images, including HyperSwitch, Lago and Kill Bill, so most of the stack can run side by side with Docker Compose on one server. Size the server for the heaviest app and add off-site backups.

How is this list ranked?

Picked by hand for each job from apps whose own description or topics match it, in curated order inside each section, with GitHub data from October 2026; an app appears only once.

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