Browse Open Source Software Alternatives

Scheduling link tool that lets recipients overlay their own calendar when picking a time, used by founders and salespeople booking meetings without email back and forth.

IT service desk from Atlassian covering request, incident, problem and change management, with asset tracking and a knowledge base, used by IT and internal service teams alongside Jira.

Virtualization and cloud platform running virtual machines, containers, hyperconverged storage and managed Kubernetes on commodity hardware, sold to hosters offering VPS and cloud services.

Business rules engine where decision logic is modeled in spreadsheet style tables, checked for conflicts and gaps, then deployed as a service that applications call at runtime.

File based CMS for PHP sites that stores content in text files instead of a database, licensed per site and used by designers building bespoke small to mid sized websites.

Data observability platform that monitors tables for freshness, volume and schema changes, with lineage and alerting so data engineers hear about broken pipelines before analysts do.

Website builder with a drag and drop editor for pages, landing pages, popups and small stores, aimed at small businesses, freelance designers and agencies working without code.

Server platform for installing and managing web apps on your own machine, handling updates, backups, domains, certificates and user accounts for teams self hosting email, chat and wikis.

Support chatbot builder that ingests documentation, help articles and PDFs to answer customer and employee questions, embedded on websites or in Slack by support teams.

Utility suite for macOS bundling junk file cleanup, antivirus scanning, VPN, ad blocking and duplicate finding, sold to consumers who want maintenance and security chores in one subscription.

Relational database system for transactional and analytical enterprise workloads, with clustering, partitioning, replication and security features for large deployments.

Managed document parsing and indexing service from LlamaIndex, extracting tables and text from complex files and keeping retrieval pipelines in sync, used by developers building question answering over documents.

Virtual office with spatial video rooms where remote teams move avatars around a floor plan to hold meetings and casual conversations.

Identity verification and compliance service running document checks, face matching and screening to meet know your customer and anti-money-laundering rules.

CRM for inside sales teams, with built in calling, SMS and email sequences, pipeline views and reporting, aimed at small teams that make a lot of outbound calls.

Identity verification platform for businesses, checking government IDs, selfies and documents to onboard users and meet know your customer rules.

Video and audio calling APIs for developers, embedding real time meetings, live streaming and recording into web and mobile applications.

Messaging app for chats, groups and channels, with cloud synced history, large file sharing and bots, used by people and communities that outgrow ordinary group chats.

Communications platform with voice and SMS APIs, phone numbers and a contact center product, used by developers sending high volume messaging and building call flows into their applications.

Email service from 37signals with its own web and mobile apps, screening new senders, grouping newsletters and receipts, sold as a yearly subscription with a personal address.

Music streaming service with a catalog of around a hundred million tracks, podcasts, playlists and lyrics, used by listeners on mobile, desktop and car systems across Europe and Latin America.

Deployment automation server that takes build artifacts and releases them to servers, Kubernetes and cloud targets across environments, used by teams that need repeatable promotions and approvals.

Development environments that run on Kubernetes and open in a browser, giving each developer a preconfigured workspace defined by a devfile, used by enterprises standardizing onboarding on OpenShift.

Customer support tool that pulls Slack, email and an in app widget into one inbox, letting product teams reply, prioritize requests and tie feedback back to the roadmap.

Coding assistant and agentic IDE with codebase aware chat, autocomplete and agents that carry out tasks end to end, shipped as a desktop app, JetBrains plugin, CLI and mobile companion.

SEO data provider offering APIs for search results, keyword volumes, backlinks and competitor metrics, billed per request and used by agencies building their own rank tracking tools.

Email and landing page design tool with drag and drop templates, used by marketers directly and embedded by software vendors who need a builder inside their product.

Data observability platform that monitors warehouses, lakes and pipelines for freshness, volume and schema breaks, alerting data teams before broken tables reach dashboards and downstream reports.

Drawing software for illustration, comics and animation, with pressure sensitive brushes, panel layout tools and frame by frame animation timelines.

Desktop and web productivity suite covering Word, Excel, PowerPoint and Outlook, sold by Microsoft with cloud storage and business mail, used for documents, spreadsheets and slides in most offices.

Feedback and bug reporting tool that captures screenshots and browser details from inside a website, for product and QA teams.

Course platform for building and selling online schools, with a site builder, video lessons, quizzes and certificates, used by trainers and education businesses.

Customer messaging platform that brings WhatsApp, Instagram, Facebook, email and calls into one shared inbox, with AI agents and routing rules used by sales and support teams.

Website builder for small service businesses that generates a site from a few answers, with hosting, a custom domain, booking links, contact forms and payment buttons included.

Kubernetes platform from Red Hat that adds build pipelines, an image registry, operators and role based access on top of upstream Kubernetes, run by enterprises on premises and in cloud.