Freemium
Penetration Testing · Security
Guided, browser-based cybersecurity training with hands-on labs from beginner to offensive paths.
pentestsecuritylearningctf
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Penetration Testing · Security
Guided, browser-based cybersecurity training with hands-on labs from beginner to offensive paths.
Serverless & BaaS · Database
Distributed SQLite-based database for edge and local-first apps.
Search Engines · Database
Open-source, in-memory search engine focused on developer experience.
Typography & Fonts · Design & Prototyping
Curated font recommendations and pairing guides with real-website examples for every family.
Feature Flags · DevOps
Open-source feature flag platform you can self-host — strategies, gradual rollouts and an activation dashboard.
Stock & Placeholders · Image & Media
High-quality free stock photos with a developer API.
Design Tools · Design & Prototyping
The largest Figma UI kit and React library — 10k+ components and variants in a clean, modern style.
Uptime & Alerting · Monitoring & Observability
Popular hosted uptime monitoring with 50 free monitors.
AI Coding Assistants · AI for Developers
Vercel's generative UI builder for React and shadcn/ui components.
PaaS & Edge · Cloud Platforms
Frontend cloud optimized for Next.js with edge functions and previews.
Reference & Standards · Security
Scan files, URLs and domains with 70+ antivirus engines.
VPS & Bare Metal · Cloud Platforms
Global cloud with simple compute, storage and Kubernetes offerings.
Vector Databases · AI for Developers
Open-source vector database with hybrid search and modules.
API Mocking · API Tools
Instantly inspect and test incoming webhooks with a temporary URL.
Load & Performance · Testing
Advanced website performance testing from global locations.
Agent & LLM Frameworks · AI for Developers
Experiment tracking, model monitoring and ML evaluation platform.
Whiteboards & Diagrams · Design & Prototyping
Fast workspace for flowcharts, wireframes and mind maps.
Simulators · IoT & Embedded
Simulate Arduino, ESP32, Raspberry Pi Pico and more in the browser — no hardware needed to test circuits and code.
Payments · API Tools
Payment gateway for Indonesia and Southeast Asia markets.