Browse Open Source Software Alternatives

Reference manager for academic writing that collects PDFs from the browser, organizes a library and inserts citations in Google Docs and Word, used mainly by researchers and students.

Monitoring for cron jobs and scheduled tasks that alerts you when an expected check in never arrives, for teams running backups and background work.

Developer platform for voice AI agents, wiring speech recognition, language models and speech synthesis into low latency phone calls, used by engineers adding automated calling to their products.

Hosted service for durable workflow execution, running Temporal clusters so backend teams can write long lived processes that survive crashes, retries and restarts without custom state handling.

Form backend that receives submissions from plain HTML forms and forwards them by email, webhook or integration, for developers running static sites.

Blogging service built by the Posterous founders, with posting by email, custom domains and a promise to keep published pages online permanently for a flat monthly fee.

WYSIWYG rich text editor that developers embed in web applications so end users can format content, insert media and paste from documents.

Business rules management system that lets analysts author, test and deploy decision logic separately from application code, run by banks and insurers on high volume transactions.

User research platform for unmoderated usability tests, surveys and prototype validation, giving product and design teams quantitative feedback from real participants.

Website builder with drag and drop pages, hosting and an online store, now part of Square and used by small businesses that sell and take payments from their own site.

Cloud storage service with end to end encrypted files, sharing links, chat and backup clients for desktop and mobile, used by people who want zero knowledge storage.

Digital painting software for artists, simulating natural media brushes, canvas textures and paint blending for illustration and concept art.

Time tracking and productivity monitoring tool that records app and website use, idle time and project hours, used by managers of office and remote teams for timesheets and billing.

Live chat and messaging tool from Freshworks for support teams, handling website chat, WhatsApp and email in one agent inbox with bots that answer routine questions.

Cloud compute service renting virtual machines by the hour, with a wide range of instance types, used by engineering teams to run servers and workloads on AWS.

Code review bot from Cursor that reads pull requests on GitHub and comments on logic bugs before merge, used by engineering teams that want a second pass on every change.

Review tool for collecting feedback on websites, PDFs, videos and images, letting clients and teammates leave comments pinned to the exact spot without creating an account.

Project management platform built for client work, with task boards, time tracking, budgets and invoicing, used by agencies and professional services teams tracking profitability per client.

Coding assistant for VS Code and JetBrains that reads your repository, proposes a plan and then writes code, letting developers bring their own keys for Claude, GPT or Gemini.

Writing tool for X that generates post ideas from your own timeline and knowledge base, with a rephraser, voice dictation and an editor for drafting and scheduling posts.

Consumer VPN service with apps for desktop, mobile and routers, encrypting traffic through servers in many countries, bundled with a password manager and breach monitoring.

Online store builder for selling digital downloads, subscriptions, physical goods and print on demand merchandise, used by creators who want checkout and delivery handled without a full ecommerce stack.

Virtual office where people move avatars around a map and start video calls by walking up to each other, used by remote teams.

IT asset discovery and CMDB software that scans networks to inventory servers, applications and dependencies, used by infrastructure teams planning data center moves and cloud migrations.

Music streaming service from Google built on YouTube's catalog, covering official releases, live versions and remixes, with offline downloads and background play for listeners who want one account across video and audio.

Private question and answer site for a company, where engineers post internal questions, vote on answers and build a searchable record of how systems work.

Compliance and audit platform covering SOC 2, ISO 27001, HIPAA and PCI DSS, pairing evidence collection with in-house auditors, used by SaaS, fintech and healthcare teams.

No-code chatbot builder for WhatsApp, Instagram, Facebook Messenger, SMS and other channels, with a visual flow editor and handoff to human agents for support and sales teams.

Health data API that connects fitness trackers, smartwatches and gym equipment, normalizing steps, sleep and workouts into one format for developers building wellness apps.

Automation service that links apps and connected devices through simple trigger and action rules, used by people who want a phone, smart light or spreadsheet to react to an event.

Data import platform that product teams embed so customers can upload spreadsheets, map columns and fix validation errors before records land cleanly in the application database.

Email client for Mac, iOS, Android and Windows that unifies several accounts, adds AI writing and thread summaries, plus encryption, read receipts and snoozing for people living in their inbox.

Global payroll and hiring platform for paying contractors and employees abroad, acting as employer of record, handling contracts, tax forms and compliance for distributed companies.

Digital signage service for scheduling playlists across screens from one dashboard, running on smart TVs, Android boxes and Raspberry Pi, priced per screen for small venues and chains.

Feedback tool for product teams, running voting boards, public roadmaps and changelogs so customer requests can be prioritized by votes and account value, then announced when shipped.