No moat. Still in business.

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Free self-hosted app for small businesses to send quotes and invoices, track client payments and take card payments online.

Free · Invoicing and billing

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A WordPress plugin to build signup and login forms, user profiles and free or paid memberships with restricted content.

Forms and surveys · Creators and writers

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Sits in front of your server to receive webhooks from Stripe, Shopify and others, logging each one so missed events can be resent.

Free plan · Developer tools · Developers

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Gives your Stripe customers a link to create, edit and download their own invoices, avoiding the Stripe invoice fee.

Since 2024

One-off payment · Invoicing and billing · Online sellers

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Adds usage limits, credits, plans and spend controls on top of Stripe so AI startups can change pricing without rebuilding billing.

Free plan · Payments and checkout · Developers

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Upload a PDF and fax it to numbers in 50 countries, paying per fax, with an email when it goes through.

Since 2017

Pay as you go · Documents and e-signature

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Manages file downloads on WordPress with password and access controls, download tracking, and options to sell digital products.

Free plan · Online shops · Online sellers

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WordPress form plugin for taking Stripe or PayPal payments, signed waivers and bookings right inside the form.

Free plan · Payments and checkout

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Shows which campaigns, links and content brought in paying customers by tying site visits to Stripe revenue.

Subscription · Website analytics · Online sellers

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Ticket selling for event organisers, from classes to festivals, paying out to your own Stripe account per sale.

Free plan · Payments and checkout · Events

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WordPress form builder for contact forms, surveys, quizzes and calculators, with entries shown as listings or directories.

Free plan · Forms and surveys

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Hosted service that runs your MCP servers behind a single URL, holds credentials and logs each tool call per client.

Since 2023

Free plan · Developer tools · Developers

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Lets WooCommerce shop owners add, remove, reorder and hide the fields customers fill in at checkout.

Free plan · Online shops · Online sellers

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Live chat and ticketing for software businesses that lets agents refund or cancel Stripe and Paddle customers inside the ticket.

Free plan · Customer support · Software companies

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Chess clubs, tournament directors and coaches handle registrations, pairings, members and payments in one place.

Free plan · Scheduling and booking · Schools and tutors

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Adds recurring billing, trials, split payments and subscription boxes to WooCommerce stores.

Free plan · Payments and checkout · Online sellers

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Mac screen recorder that adds automatic zooms, captions and vertical layouts so demos and lessons look polished.

One-off payment · Video and audio · Creators and writers

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Hold one key and speak to type into any Mac app, with speech turned into text offline on your own machine.

One-off payment · Focus and productivity · Individuals and families

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A shared workspace where teams run Claude Code, Codex and other coding agents on tasks, scheduled bots and reviewed pull requests.

Free plan · Developer tools · Developers

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Tracks billable hours for agencies and freelancers, then builds invoices that clients can pay by card.

Since 2011

Free trial · Invoicing and billing · Agencies

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Gives you one fixed webhook URL that forwards Stripe and Paddle events to whichever branch deployment you are testing.

Free plan · Developer tools · Developers

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Free open source desktop tool that plots millions of table rows visually so analysts can spot outliers and odd patterns.

Since 2024

Free · Data and spreadsheets

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WordPress plugin for member sign up, login, profiles, directories and members-only content on your own site.

Free plan · Communities and memberships

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Gives local dev servers a stable public URL for testing webhooks and OAuth or sharing previews, with flat seat pricing.

Since 2023

Free plan · Developer tools · Developers

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Sell digital files through your own Stripe account with branded download pages and no extra transaction fees.

Subscription · Payments and checkout · Online sellers

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WordPress plugin that adds Buy Now buttons so site owners can take PayPal and card payments in a popup checkout.

Free · Payments and checkout · Online sellers

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An API for adding license keys, device activation and secure update delivery to desktop and on-premise software.

Since 2016

Developer tools · Developers

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Receives webhooks for your app, retries failed deliveries and keeps a replayable history so no events get lost.

Free plan · Developer tools · Developers

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Send files from scripts, AI agents or a browser as short links with expiry dates, passwords and download caps.

Since 2026

Free plan · Developer tools · Creators and writers

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Checks a Stripe account for payments that skipped card checks and gives Radar rules to stop card testing fraud.

Free plan · Payments and checkout · Online sellers

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Keeps client IT records, tickets and invoices in one place, for managed IT service providers, self-hosted or hosted.

Free · Customer support

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A WordPress plugin that takes room bookings, handles rates and payments for hotels, B&Bs and rentals.

Free plan · Scheduling and booking · Hotels and hospitality

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Adds a shopping cart and checkout to an existing website, blog or link page so you can sell products without a new store.

Since 2022

Subscription · Payments and checkout · Online sellers

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A free WordPress plugin for taking one-off and recurring payments through buy buttons, payment forms and invoices.

Free plan · Invoicing and billing

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Helps developers prepare for coding interviews by rebuilding algorithm solutions from memory with spaced repetition drills.

Free plan · Courses and learning · Individuals and families

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Create AI agents from a system prompt, test them with simulated users, then publish a chat app or API without a backend.

Developer tools · Developers

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Hosted status pages with built-in uptime checks, so you can keep customers informed during outages and cut support tickets.

Free plan · Uptime and monitoring · Software companies

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Runs an affiliate program inside WooCommerce using coupon codes and referral links, with dashboards and commission payouts.

Free plan · Online shops · Online sellers

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Runs walking challenges for companies, with departments competing on a live step leaderboard through a phone app.

Free plan · Health and habits

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Send app events with one HTTP call, then search them and get them delivered to Slack, Discord, Telegram or webhooks.

Free plan · Developer tools · Developers

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Build hosted or embedded checkout pages to sell products, subscriptions, tickets and services through your own Stripe account.

Since 2018

Free plan · Payments and checkout · Online sellers

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Sends app emails like password resets through an API or SMTP, plus product updates and automated sequences, for SaaS companies.

Free trial · Email marketing · Software companies

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Turns prompts into editable Python for mesh modelling, simulation setup and 3D printing, with shareable 3D results.

Free plan · Design and images · Manufacturing

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Builds forms and quizzes from a prompt, PDF or pasted text, with scoring, logic, payments and embeds for businesses.

Forms and surveys

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A drag and drop builder for startup founders to make landing pages, blogs and directory sites without a designer.

Free plan · Website builders · Freelancers

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Builds automated workflows and AI agents that connect hundreds of apps, as a hosted service or on your own servers.

Free plan · Automation and integrations

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WordPress clinic system for booking appointments, keeping patient records and running video consultations.

Free plan · Scheduling and booking · Health and clinics

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Hosted service that receives, logs and retries webhooks, with a CLI for local testing and a typed SDK.

Since 2024

Developer tools · Developers