Explore Software

TOAST UI Calendar is a feature-rich, open-source JavaScript calendar library designed to help web developers easily integrate scheduling capabilities into their applications. It offers support for multiple view types, responsive design, and intuitive drag-and-drop interactions. Built with extensibility in mind, the library allows developers to customize styles, templates, and behaviors to match their specific project requirements. It is widely adopted for building robust front-end user interfaces requiring detailed calendar management.

✦ Best for web developers needing a free, highly customizable calendar ui

Listmonk is a free, open‑source platform that lets technical users create, send, and track newsletters and transactional emails. It runs on any server and offers a clean web UI plus a powerful REST API. Designed for developers, Listmonk integrates with popular email delivery services like Mailgun and Sendgrid, providing full control over data, templates, and subscriber management while keeping costs low.

✦ Best for developer teams needing a self‑hosted, free newsletter manager with api integration

CK-12 is a non-profit organization dedicated to increasing access to educational materials through its flexible, customizable web-based platform. It provides high-quality digital textbooks, simulations, and practice exercises primarily focused on science, technology, engineering, and mathematics (STEM) subjects. The platform empowers teachers to tailor content to their specific curriculum needs while offering students personalized learning experiences through adaptive practice tools and interactive modules. By leveraging open-educational-resource (OER) principles, CK-12 makes comprehensive learning resources accessible to classrooms worldwide without subscription costs.

✦ Best for k-12 educators and students seeking free, customizable stem resources.

BrainPOP is a widely used digital educational platform that uses animated movies, interactive quizzes, and creative tools to explain complex topics across science, math, social studies, and more. It helps teachers supplement their daily lessons with accessible, standards-aligned resources that spark curiosity and reinforce key concepts. The platform supports diverse learning styles through leveled reading materials, concept mapping, and game-based learning experiences. Educators can track student progress through built-in assessment tools, making it a comprehensive resource for both classroom instruction and remote learning environments.

✦ Best for k-8 teachers and families seeking engaging animated stem and core subjects.

AFFiNE is a versatile and customizable workspace that combines the features of note-taking apps, knowledge management tools, and project management software. It allows users to create a personalized workspace that adapts to their unique needs and workflows.

✦ Best for teams needing adaptable workflows and strong security

Out of Milk is a popular mobile shopping list application designed to streamline grocery trips and household inventory management. It helps users organize items into custom lists, track pantry staples, and stay on top of household chores collaboratively. With real-time list sharing and synchronization capabilities, families and roommates can easily update shopping lists on the go. The app also includes price-tracking features and recipe box storage to make meal planning more efficient.

✦ Best for families and roommates needing real-time collaborative grocery lists.

kaneo is an open source project management tool designed to be simple and efficient. It aims to provide all the necessary features for project management without unnecessary complexity.

✦ Best for small teams and solo freelancers

MkDocs is a fast, simple, and downright gorgeous static site generator that's geared towards building project documentation. Documentation source files are written in Markdown, and configured with a single YAML configuration file.

✦ Best for small to medium-sized project documentation needs

Feedly is a news aggregator service that allows users to customize their feeds. It provides a simple and intuitive way to stay up-to-date with the latest news and trends from around the world. With Feedly, users can create personalized feeds based on their interests and preferences, and access them from anywhere.

✦ Best for news enthusiasts and professionals

Flarum is a free, open-source forum software that allows users to create and manage online communities. It is designed to be simple, fast, and easy to use, with a focus on providing a great user experience.

✦ Best for small to medium-sized online communities

Ledger is a double-entry accounting system with a command-line reporting interface. It allows users to track their finances and generate reports in a simple and efficient manner.

✦ Best for developers and technical finance enthusiasts

JeecgBoot is an enterprise-level AI low-code platform that enables users to generate entire systems with just one sentence. It features AI Skills, which allows users to draw flowcharts, design forms, generate reports, and create dashboards. The platform also includes an AI application platform with AI chat, knowledge base, process orchestration, and MCP plugins, compatible with mainstream large models. JeecgBoot leads the AI low-code development mode, solving 90% of repetitive work in Java projects and improving efficiency without losing flexibility.

✦ Best for enterprise teams seeking rapid ai-powered development