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Handpicked Open Source Alternatives to Paid Softwares

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Best Open Source Finance & Fintech Tools in 2026

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Finance & Fintech

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Web & App Development

BigchainDB

stars 4Kforks 760

Blockchain database with high throughput and low latency

Database Web3 API Development Tools+4

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DocuSeal

stars 18.4Kforks 1.8K

Open source document signing and fillable PDF forms

Workflow Automation Self Hosted API Infrastructure+5

Lago

stars 10.4Kforks 726

Usage-based billing API for metered and hybrid SaaS pricing

API Infrastructure Invoicing & Payments Payment Infrastructure+4

OpenBB

stars 71.5Kforks 7.3K

Open source AI research workspace for financial analysis

AI Agents Data Visualization LLM+4

QuestDB

stars 17.2Kforks 1.6K

Ingest high-frequency data and query it in real time with SQL

Database Self Hosted Data Visualization+4