B2B SaaS that sells to companies
Your customers are teams inside companies. Sooner or later an IT department asks for SSO, audit trails and invoices, and a lost email or an outage costs you a contract.
11 makers' products and 15 open-source projects use at least half of these 9 tools.The picks
The framework most B2B SaaS starters and enterprise auth SDKs target first.
Chosen for frontend framework by 1506 makers' products we track · the alternatives →
SAML SSO and SCIM directory sync, the two things enterprise buyers ask for, as a service — with sign-in for small teams on the free tier.
Chosen for authentication by 19 makers' products we track · the alternatives →
Managed Postgres with branching, so every preview and migration test gets its own copy of the schema.
Chosen for database by 95 makers' products we track · the alternatives →
One schema file, typed queries and reviewable migrations — useful when a second developer joins.
Chosen for database access & ORMs by 37 makers' products we track · the alternatives →
Invoices, seats, purchase orders and tax IDs — the billing features company buyers expect.
Chosen for payments by 869 makers' products we track · the alternatives →
Transactional-only sending with fast, reliable delivery, so password resets and invites don't land in a corporate spam filter.
Chosen for transactional email by 612 makers' products we track · the alternatives →
Reliable multi-step work — imports, syncs, scheduled reports — with retries and a history you can show support.
Chosen for background jobs & cron by 16 makers' products we track · the alternatives →
Errors tied to the customer and release, so you can answer "is it fixed?" when an account manager asks.
Chosen for error monitoring by 162 makers' products we track · the alternatives →
What this costs you
Enterprise-ready pieces cost more from day one — WorkOS charges per SSO connection, Postmark's free plan is small. If your first customers are small teams, start with Clerk or Better Auth and add WorkOS when the first SSO request arrives with a contract.
Who builds this way
Using at least half of these tools, each with a source: makers' products from their own words, customer stories, subprocessor lists or websites; open-source projects from their code.
inbox-zeroOpen-source AI email assistant that triages, labels and drafts replies to help clear your inbox.6 of these 9 tools
VybeLovable for internal apps6 of these 9 tools
ClientJamAI-powered lead generation for designers and agencies5 of these 9 tools
cogneeMemory for AI Agents in 6 lines of code5 of these 9 tools
MacalyMacaly is an AI builder that generates websites and apps from prompts, with direct editing, a built-in database, visitor analytics and publishing to your own domain.5 of these 9 tools
ParagonIntegrate with your users' other SaaS apps - 7x faster.5 of these 9 toolsPDFShiftAn API to convert HTML/CSS documents to PDF. PDFShift is the reliable, Up-to-date and high-fidelity conversion API with no maintenance costs.5 of these 9 tools
ProductlaneCustomer support tool built on Linear, with a shared inbox for chat, Slack and email plus a customer portal, public roadmap and changelog; conversations become Linear issues.5 of these 9 tools
QA.techAI testing tool whose agents run through a web app like real users on each release or pull request to find broken flows, for software teams replacing manual QA.5 of these 9 tools
Toffu AIMarketing agent that doesn’t circle back tomorrow5 of these 9 tools
WalkSmartFree Walking Tour Generator5 of these 9 toolsAutoGPTopen sourceAutoGPT is the vision of accessible AI for everyone, to use and to build on. Our mission is to provide the tools, so that you can focus on what matters.6 of these 9 toolsever-worksopen sourceEver® Works™ - The Workshop for AI. An open agentic runtime that autonomously researches, ships, and maintains entire businesses, 24/7 - https://ever.works6 of these 9 toolslabelflowopen sourceThe open platform for image labelling6 of these 9 toolsegghead-nextopen sourceThe frontend for egghead.io.5 of these 9 toolsOpenAssistantGPTopen sourceA Community Open-Source Saas for Crafting/Building/Creating Chatbots with OpenAI's Assistant API that you can add to your website.5 of these 9 toolsralllyopen sourceRallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.5 of these 9 tools
supersetopen sourceDesktop IDE for running several coding agents in parallel, each in an isolated workspace, with notifications and a diff viewer for reviewing their changes. Has a companion iPhone app; aimed at developers who work with coding agents.5 of these 9 toolscal.diyopen sourceScheduling infrastructure for absolutely everyone.5 of these 9 toolscoreopen sourceA high-performance, enterprise-grade Next.js 16 application for mission-focused non-profit organizations. Built for high impact teams. 5 of these 9 toolsdevlovers.netopen sourceDevLovers Technical Interview Platform -> https://www.devlovers.net5 of these 9 toolshexclaveopen sourceThe user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else.5 of these 9 toolslearnhouseopen sourceThe Next-gen Open Source learning platform for everyone ✨5 of these 9 toolsquentiopen sourceThe open source Quizlet alternative.5 of these 9 toolsShipFreeopen sourceOpen Source Next.js Saas Boilerplate5 of these 9 toolstypebot.ioopen source💬 Typebot is a powerful chatbot builder that you can self-host.5 of these 9 tools