Payment Processing & SaaS Billing

DJ

DjaoDjin

4.3/5.01 verified review

Freemium

Platform-as-a-service to build compliance survey products and subscription management.

• Open-source core available for auditing and self-hosted installations.
• Native support for recurring billing and payment gateways.
• Architecture tailored for rapid creation of assessment and survey platforms.

143stars on GitHub

DO

Donorbox

4.3/5.01 verified review

Freemium

Fundraising software and donor management CRM for nonprofit organizations.

• Fast checkout flow designed to minimize donor drop-off rates.
• Comprehensive suite covering crowdfunding, peer-to-peer, and events.
• Integrated CRM for tracking and improving donor retention.

33stars on GitHub

GU

Gumroad

4.3/5.01 verified review

Freemium·Open Source·MIT

E-commerce platform for independent creators to sell digital products directly.

• Rapid setup for digital storefronts and checkout flows.
• Native support for multiple currencies and subscriptions.
• Open source availability and flexible extension options.

10.0kstars on GitHub

HA

Harvest

4.2/5.01 verified review

Freemium

Time tracking and billing software to optimize project profitability.

• Intuitive interface with cross-platform timer support.
• Detailed analytics for project and client profitability.
• Verified integrations with accounting and project management tools.

WA

Wave

4.1/5.01 verified review

Freemium

Financial management, accounting and invoicing software for small businesses.

• Permanent free tier for accounting and invoicing without time limits
• Intuitive interface tailored for freelancers and small businesses
• Native integration between invoicing, accounting, and online payments

KO

Ko-fi

4.0/5.01 verified review

Freemium

Monetization platform for creators to receive tips, sales, and memberships.

• No platform transaction fees on the basic free tier.
• Direct integration with payment gateways for immediate fund transfer.
• Supports multiple income streams including tips, shop, and memberships.

PA

PayPal

4.0/5.01 verified review

Freemium

Global online payments platform for processing electronic transactions.

• Widespread global acceptance in e-commerce
• Flexible APIs for payment integration
• Multi-currency support for cross-border transactions

PA

Patreon

3.9/5.01 verified review

Freemium

Membership and monetization platform for content creators and digital communities.

• Reliable payment infrastructure tailored for independent creators.
• Direct tooling for membership-driven community management.
• Simplified workflows for exclusive content distribution.

BM

Buy Me a Coffee

3.7/5.01 verified review

Freemium

Web platform for creators and artists to accept support and memberships from fans.

• Extremely fast initial setup in under a minute.
• Support for one-time donations and recurring memberships.
• User interface optimized for quick mobile payments.