Sunil Kumar Dash

for Composio

Posted on Jan 9

9 top open-source tools to fuel your SaaS journey in 2025🚀

#webdev #programming #ai #javascript

2025 is going to be the best year for building your dream SaaS. There are many things to build, and it has become extremely easy to code and manage complete apps thanks to large language models.

However, finding what to use for which use cases can be very confusing. So, I curated this list of open-source tools that will make your SaaS journey smoother.

1. AI SDR-Kit: Build AI sales agent to automate SalesOps

Let’s be honest; it’s tough to succeed in B2B SaaS without an efficient sales team. And someone who has seen all the processes up close, all these processes of lead identification, qualification, outreach, and whatnot can be daunting for a bootstrapped business.

But it doesn’t have to.

With AI SDR-Kit, you can build your own sales force (pun intended) using AI. It allows your agents to integrate with apps like HubSpot, Calendly, MailChimp, Slack, etc, to automate complex workflows.

It offers

60+ app integrations across sales processes like CRM, Email services, etc.
Compatibility with 15+ agentic frameworks, including LangChain, LlamaIndex, etc.
It handles complex authentication flows like OAuth, ApiKey, and Basic for easy integration.

Building with it is easy. You can integrate multiple apps and actions within a few lines of code.

Here are examples of sales agents.

Lead Generator Agent: Integrate with People Data Labs API to build an agent that discovers qualified leads and syncs enriched data to Google Sheets programmatically.
Outreach agent: Connect HubSpot CRM and Gmail APIs to create an automated outreach workflow that handles personalized email sequences and lead nurturing.

2. OpenHands: Platform for AI software developer agents

OpenHands is one of the leading open-source platforms for AI agents and a direct competitor of Devin. You can build features, test, and iterate similar to Devin.

To start with OpenHands, you need Docker version 26.0.0+ or Docker Desktop 4.31.0+ and Linux, Mac, or WSL.

Pull the docker image and run the container.

docker pull docker.all-hands.dev/all-hands-ai/runtime:0.12-nikolaik

docker run -it --rm --pull=always \
    -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:0.12-nikolaik \
    -v /var/run/docker.sock:/var/run/docker.sock \
    -p 3000:3000 \
    --add-host host.docker.internal:host-gateway \
    --name openhands-app \
    docker.all-hands.dev/all-hands-ai/openhands:0.12

After running the command above, you'll find OpenHands running at http://localhost:3000.

Upon launching OpenHands, you'll see a settings modal. Select an LLM Provider and LLM Model and enter a corresponding API Key. You can change these anytime by selecting the UI's Settings button.

If your model is not listed, toggle the advanced mode and enter it manually.

They provide four methods for working with Agents: an interactive GUI, a command-line interface (CLI), and options for non-interactive use through headless mode and GitHub Actions. Each has its pros. For more, refer to the documentation.

3. Shadcn: Beautifully designed components that you can copy and paste into your apps

You know how sometimes you just want to build your app without spending hours designing every little button and dropdown? That's where Shadcn comes in.

It saves a lot of time compared to designing similar components from scratch. You need a component; look it up in Shadcn, copy and paste it into your application, and you are done.

It supports almost all the popular front-end libraries and frameworks, such as React, Next, Astro, Gatsby, and Remix.

Check out the documentation for more information on Shadcn.

4. Posthog: Open-source analytics platform

Posthog is an open-source product analytics platform that does way more than just track user behavior!
Think of it as your all-in-one toolkit for understanding and improving your product. What makes it particularly cool is how it brings together analytics, feature flags, and experimentation all in one place.

An all-in-one analytics suite with event tracking shows how users navigate your product and where they might get stuck.
Built-in session recordings let you watch real user interactions, helping you understand why users behave certain ways.
Test different versions of features or designs and see what works best with built-in A/B testing.

5. Neon: Serverless Postgress

If you want to build fast and don’t want to host and manage your own databases, Neon is the perfect choice.

What makes it special is that it brings Git-like branching to databases, letting you create instant copies of your database for testing or development.

It's perfect for modern development workflows where you want to test changes without messing with your production data.

6. Laudspeaker - Open-source Onboarding

User communication is an essential aspect of building SaaS. Laudspeaker is an open-source customer messaging platform that gives you sophisticated control over your user communications.

Brings all your messaging channels (email, SMS, push) into one central place
Provides a visual workflow builder for creating complex message sequences
Integrates with your user data to enable behavior-based messaging
Built-in A/B testing

7. Resend - Email platform for modern SaaS

Resend is a modern email API platform that makes sending transactional and marketing emails remarkably straightforward.

Delivers excellent email deliverability with built-in best practices
Provides real-time analytics on email performance and engagement
Offers React-based email components for building beautiful emails.

8. Dittofeed - Open-source customer engagement

Dittofeed focuses on making customer journey automation more developer-friendly and scalable. It can improve customer engagement and conversions.

If someone contacts you, it'll send scheduled emails until you get a response.
Smoothly combines email, SMS, and other messaging types in a single workflow.
Works right out of the box with Resend for email, Twilio for SMS, and Postmark for transactional messages

9. Postiz: - Open-source social media scheduling agent

You have built the app, and everything is in place. What now? Marketing and social media are the best vectors for it, but handling social media can be very hectic, such as Reddit, Facebook, TikTok, etc.

Postiz is the only open-source social media scheduling tool and is extremely good.

It will help you

Post content on multiple social media at the same time.
Schedule your content (time it) so you post it when people are online.
Get help from AI to generate content so you can create content faster.
If you are lazy, add your social media channels and let somebody else manage them.