Mailgun
Email API for sending, receiving and tracking transactional mail
466 tools in our directory are listed as freemium, from 30 sections: Productivity & Collaboration (36), No-Code & Automation (35), Generative AI (28), Backend Services (27) and 26 more sections.

Email API for sending, receiving and tracking transactional mail

Email API, SMTP and test sandbox for developer and product teams

Backlink index and link analysis tools for SEO research


Simple SEO tools for keywords, rankings and backlinks


Map tiles, geocoding and mapping SDKs for web and mobile apps

AI employees that handle inbox, social, SEO and lead generation

User research platform for testing, surveys and recruiting

In-memory graph database for connected data and AI context

AI diagram editor for flowcharts, sequences and system designs

Online editor for writing and previewing Mermaid text diagrams

Social media planner, analytics and reporting in one workspace

Microsoft cloud platform for hosting apps, data and AI

Relational database from Microsoft with built-in AI features


Event-based product analytics for tracking user behavior

Searchable library of app and website screens for design reference

Generate realistic test data as CSV, JSON, SQL or Excel

Create and run mock APIs locally with free open-source tools


Stem separation, practice tools and recording for musicians

Work management platform for boards, tasks and team workflows

Document database with vector search, self-hosted or in the cloud

Managed MongoDB database service for apps, search and AI agents

Session replay, heatmaps and feedback for website UX

Free SEO tools and a paid suite for keyword, link and site research


Online whiteboard and visual workspace for workshops and planning


Free static website hosting with a browser-based HTML editor



Observability platform for applications, infrastructure and logs

Secure tunnels that share local apps and webhooks on a public URL


Portal builder for client-facing apps on your existing data

All-in-one workspace for docs, wikis, databases and projects

Icon and stock photo library made by independent creators

API for email, calendar and meeting data across providers

Private Markdown notes stored as local files on your device

Release and deployment automation for continuous delivery teams

Ecommerce email and SMS marketing with automation and reports

Write, run and share code in 110+ languages in the browser


Serverless functions that run on any Kubernetes cluster

Preview how links look on social media and generate OG images

Weather, forecast and air quality APIs with a free daily tier
Looking for something else? Browse the full directory.