3D Graphics Software

Alternatives to: AutoCAD

Open source	Stars	Private
Blender		-
FreeCAD		-

API Documentation

Alternatives to: Gitbook, ReadMe

Open source	Stars	Private
Docusaurus		-

API Gateway

Alternatives to: Apigee

Open source	Stars	Private
Apache APISIX		Yes

API Platform

Alternatives to: Postman

Open source	Stars	Private
Fusio		Yes
Hoppscotch		Yes
Insomnia		-

Accounting

Alternatives to: Xero

Open source	Stars	Private
Akaunting		Yes
Crater		-
InvoiceNinja		Yes

Audio space

Alternatives to: Clubhouse, Twitter Spaces

Open source	Stars	Private
Jam	Repo	-

Auth & SSO

Alternatives to: Auth0, Firebase Authentication, Okta

Open source	Stars	Private
Authentik		-
BoxyHQ		-
Cerbos		Yes
FusionAuth		Yes
Hanko		Yes
Keycloak		Yes
OPAL (Permit.io)		Yes
Ory		Yes
Oso		Yes
Supertokens		Yes

Backend as a Service (BaaS)

Alternatives to: Firebase

Open source	Stars	Private
Amplication		Yes
Appwrite		Yes
Kuzzle		Yes
Nhost		Yes
Otomi		-
Supabase		Yes

Business Intelligence

Alternatives to: DataStudio, Mode Analytics, PowerBI, Tableau

Open source	Stars	Private
Metabase		Yes
Preset		Yes

CMS

Alternatives to: Contentful

Open source	Stars	Private
Builder		Yes
Concrete		Yes
Directus		Yes
Ghost		Yes
LavaLite		-
Netlify CMS		Yes
Plasmic		Yes
Strapi		Yes
Sulu		Yes
Tina		Yes
Umbraco		Yes
Webiny		Yes
Winter		-
WordPress		Yes

Calendar

Alternatives to: Google Calendar

Open source	Stars	Private
FullCalendar		Yes

Cloud Asset Inventory

Alternatives to: AWS Config, AWS GuardDuty, GCP Cloud Asset Inventory

Open source	Stars	Private
CloudQuery		Yes

Cloud Data Warehouse

Alternatives to: Snowflake

Open source	Stars	Private
Databend		-

Cloud Storage

Alternatives to: Amazon S3

Open source	Stars	Private
Ceph		-
Minio		Yes
Storj		Yes

Code collaboration tools

Alternatives to: BitBucket, GitHub

Open source	Stars	Private
Codeberg	Repo	-
GitLab		Yes
Gitea		-
Gogs		-
OneDev		-
Pagure		-
Sturdy		Yes

Collaborative IPS Security

Alternatives to: GreyNoise

Open source	Stars	Private
CrowdSec		Yes

Communication

Alternatives to: Twilio

Open source	Stars	Private
Fonoster		Yes
Plivo		Yes

Customer Data Platform

Alternatives to: Segment

Open source	Stars	Private
Jitsu		Yes
Rudderstack		Yes

Customer Engagement

Alternatives to: Intercom, Zendesk

Open source	Stars	Private
Chaskiq		Yes
Chatwoot		Yes
Papercups		Yes

Cybersecurity

Alternatives to: AWS Config, AWS GuardDuty, GCP Cloud Asset Inventory, GreyNoise, OpenVPN, OpenVPN Access Server, Tailscale, Tenable Nessus

Open source	Stars	Private
CloudQuery		Yes
CrowdSec		Yes
Firezone		Yes
Gravitl		Yes
Nuclei		Yes

Database as a Service (DBaaS)

Alternatives to: Amazon Aurora, Firebase Database, Google Cloud Spanner

Open source	Stars	Private
PingCAP		Yes
Supabase Postgres		Yes
Yugabyte		Yes

Dependency Vulnerability Scanner

Alternatives to: GitHub Dependabot, Snyk

Open source	Stars	Private
LunaTrace		Yes

Design

Alternatives to: Figma

Open source	Stars	Private
Modulz		Yes
Penpot		Yes
Quant UX		-

Desktop Browser

Alternatives to: Google Chrome

Open source	Stars	Private
Brave Browser		Yes
Firefox	Repo	Yes

Dev Environment Management

Alternatives to: GitHub Codespaces

Open source	Stars	Private
Daytona		-

Document editor

Alternatives to: Google Docs

Open source	Stars	Private
Collabora Online		Yes
CryptPad		Yes
EtherPad		-
HedgeDoc		-
OnlyOffice		Yes

E-commerce

Alternatives to: BigCommerce, Ecwid, Shogun, Shopify

Open source	Stars	Private
Bagisto		Yes
Mailchimp Open Commerce		Yes
Medusa		Yes
PrestaShop		-
Saleor		Yes
Shuup		Yes
Sylius		Yes
Vendure		Yes
Vue Storefront		Yes
WooCommerce		Yes

ELT / ETL

Alternatives to: Fivetran

Open source	Stars	Private
Airbyte		Yes
Dagster		Yes
Kestra		-
Orchest		Yes
Prefect		Yes

ERP / CRM

Alternatives to: HubSpot, Microsoft Dynamics, Oracle Fusion ERP Cloud, SAP, Salesforce

Open source	Stars	Private
DoliCloud		Yes
Erpnext		Yes
Odoo		Yes
SuiteCRM		Yes
erxes		Yes

Email marketing

Alternatives to: Mailchimp, Sendinblue

Open source	Stars	Private
Keila		Yes
Mailtrain		-
Mautic		-
listmonk		-

Enterprise Search

Alternatives to: AWS Kendra, Algolia, Elastic Cloud, Google Vertex AI, QnA Maker

Open source	Stars	Private
AppBase		Yes
Elastic Search		-
Jina.ai		Yes
Meilisearch		Yes
Qdrant		Yes
SeMI's Weaviate		Yes
TypeSense		Yes
Zilliz's Milvus		Yes
Zinc Labs's Zinc		Yes
deepset		Yes

eSignature

Alternatives to: DocuSign

Open source	Stars	Private
Documenso		Yes

Feature flag and toggle management

Alternatives to: LaunchDarkly

Open source	Stars	Private
FlagSmith		Yes
GrowthBook		Yes
Unleash		Yes

File Hosting

Alternatives to: Dropbox, Google Drive

Open source	Stars	Private
Filestash		Yes
Nextcloud		Yes
Owncloud		Yes
Seafile		-

Financial Service

Alternatives to: Bloomberg

Open source	Stars	Private
OpenBBTerminal		Yes

Forum Software

Alternatives to: Circle, Tribe

Open source	Stars	Private
Discourse		Yes
Flarum		-
Forem		Yes
Vanilla		Yes

Game Engine

Alternatives to: Unity, Unreal Engine

Open source	Stars	Private
Godot		-
Heaps		-

Graph database

Alternatives to: Amazon Neptune, TigerGraph

Open source	Stars	Private
ArangoDB		Yes
Dgraph		Yes
Memgraph		Yes
Neo4j		Yes
TerminusDB		Yes

Helpdesk Solution

Alternatives to: Zendesk

Open source	Stars	Private
Helpy		Yes
Peppermint		Yes
UVdesk		Yes
Zammad		Yes

Internal Tools

Alternatives to: Retool

Open source	Stars	Private
AppSmith		Yes
Budibase		Yes
Lowdefy		Yes
Tooljet		Yes

Kanban

Alternatives to: Trello

Open source	Stars	Private
Focalboard		Yes
Kanboard		-
Restyaboard		Yes
Wekan		-

Log Management

Alternatives to: Papertrail, Splunk

Open source	Stars	Private
GoAccess		-
Graylog		Yes
Quickwit		-

ML Ops

Alternatives to: AWS SageMaker, BigQuery ML, Google Vertex AI

Open source	Stars	Private
Cortex		Yes
MindsDB		Yes
Ploomber		Yes
Seldon		Yes
Zilliz's Towhee		Yes

Media System

Alternatives to: Emby, Plex

Open source	Stars	Private
Jellyfin		-
Kodi		-

Messaging

Alternatives to: Discord, Microsoft Teams, Slack

Open source	Stars	Private
Element		Yes
Fosscord		-
Mattermost		Yes
Revolt		-
Rocket.chat		Yes
Twake		Yes
Wire		Yes
Zulip		Yes

Metrics store

Alternatives to: Looker

Open source	Stars	Private
Cube.js		Yes
LightDash		Yes
MLCraft		Yes
MetriQL		Yes

Mobile operating system

Alternatives to: Apple iOS

Open source	Stars	Private
Android	Repo	Yes
LineageOS		-
postmarketOS	Repo	-

NPM registry

Alternatives to: NPM

Open source	Stars	Private
Verdaccio		-

No-code database

Alternatives to: AirTable

Open source	Stars	Private
Baserow	Repo	Yes
NocoDB		Yes
Rowy		Yes

Notetaking

Alternatives to: Evernote, Notion, Onenote, Roam Research

Open source	Stars	Private
AppFlowy		Yes
Athens Research		Yes
Bangle.io		Yes
Boost Note		Yes
Dendron		Yes
GitNoter		-
Joplin		Yes
Logseq		Yes
Notabase		Yes
Outline		Yes
Trilium.cc		Yes

Observability and monitoring

Alternatives to: AWS Lookout, Anodot, DataDog, NewRelic, Outlier, Sisu Data, LangSmith

Open source	Stars	Private
Chaos Genius		Yes
GlitchTip	Repo	-
Grafana		Yes
Helicone		Yes
Netdata		Yes
Promotheus		-
Sentry		Yes
SigNoz		Yes
Uptrace		Yes
VictoriaMetrics		Yes

Online interactive forms

Alternatives to: Typeform

Open source	Stars	Private
FormKit		-
OhMyForm		-
Super Easy Forms		-

Password manager

Alternatives to: 1Password, Lastpass

Open source	Stars	Private
AuthPass		-
BitWarden		Yes
Buttercup		-
KeePassXC		-
Padloc		Yes
Passbolt		Yes

Personal Finance

Alternatives to: YouNeedaBudget (YNAB)

Open source	Stars	Private
Actualbudget		-

Photo sharing platform

Alternatives to: Instagram

Open source	Stars	Private
Pixelfed		-

Platform as a Service (PaaS)

Alternatives to: Heroku, Render

Open source	Stars	Private
CapRover		-
Coolify		Yes
Dokku		-
OpenFaaS		-
Porter		Yes
Qovery		Yes
Space Cloud		Yes
Tsuru		-

Presentations

Alternatives to: Google Slides

Open source	Stars	Private
DeckDeckGo		Yes
reveal.js		-

Product Analytics

Alternatives to: Amplitude, MixPanel

Open source	Stars	Private
PostHog		Yes

Product Feedback

Alternatives to: Canny

Open source	Stars	Private
Astuto		-
ClearFlask		Yes
Fider		Yes
LogChimp		-

Project Management

Alternatives to: Asana, Jira, Notion, Trello

Open source	Stars	Private
Focalboard		Yes
Kanboard		-
Leantime		-
OpenProject		Yes
Restyaboard		Yes
Taiga		Yes
Vikunja		Yes
Wekan		-

Raw Image Processing

Alternatives to: Adobe Lightroom

Open source	Stars	Private
RawTherapee		-
darktable		-

Remote connectivity

Alternatives to: Teamviewer

Open source	Stars	Private
Apache Guacamole		-
MeshCentral		-
Myrtille		-
Remotely		-
RustDesk		-

Reverse ETL

Alternatives to: Hightouch, NewRelic

Open source	Stars	Private
Grouparoo		Yes

Robotic Process Automation (RPA)

Alternatives to: UiPath

Open source	Stars	Private
RoboCorp		Yes

SQL Editor

Alternatives to: TablePlus

Open source	Stars	Private
Beekeeper Studio		Yes
Dbeaver		-

Scheduling

Alternatives to: Calendly

Open source	Stars	Private
Cal.com (Calendso)		Yes

Server control panel

Alternatives to: cPanel

Open source	Stars	Private
Hestia		-
Vesta		Yes
Webmin		-

Session replay software

Alternatives to: FullStory, LogRocket

Open source	Stars	Private
OpenReplay		Yes
rrweb		-

Social media

Alternatives to: Facebook

Open source	Stars	Private
Mastodon		-

Static web deployment

Alternatives to: Netlify, Vercel

Open source	Stars	Private
StaticDeploy		-

Streaming

Alternatives to: Twitch

Open source	Stars	Private
Glimesh		Yes

Team Wiki

Alternatives to: Tettra

Open source	Stars	Private
BookStack		-
Docuwiki		-
Outline		Yes

Timeseries database

Alternatives to: Kdb+

Open source	Stars	Private
InfluxDB		Yes
QuestDB		Yes
TDengine		Yes
TimescaleDB		Yes

VPN Server

Alternatives to: OpenVPN, OpenVPN Access Server, Tailscale

Open source	Stars	Private
Firezone		Yes
Gravitl		Yes

Vector graphic design

Alternatives to: Adobe Illustrator

Open source	Stars	Private
Inkscape	Repo	-

Vector search engine

Alternatives to: Algolia, Google Vertex AI

Open source	Stars	Private
Qdrant		Yes
SeMI's Weaviate		Yes
Zilliz's Milvus		Yes

Video Conferencing

Alternatives to: Agora, Twilio, Zoom

Open source	Stars	Private
BigBlueButton		-
Jitsi		Yes
LiveKit		Yes
OpenVidu		Yes

Video platform

Alternatives to: YouTube

Open source	Stars	Private
NodeTube		-
Peertube		-

Vulnerability scanner

Alternatives to: Tenable Nessus

Open source	Stars	Private
Nuclei		Yes

Website analytics

Alternatives to: Google Analytics

Open source	Stars	Private
Ackee		-
Countly		Yes
Fathom		Yes
GoatCounter		Yes
Matomo		Yes
Open Web Analytics		-
Plausible		Yes
Scale8		Yes
Umami		Yes

Workflow automation

Alternatives to: Integromat, Zapier

Open source	Stars	Private
ActiveWorkflow		-
Beehive		-
Flogo		-
Huginn		-
N8N		Yes
Node-RED		-
Pipedream		Yes
Temporal		Yes
Windmill		Yes

Writing platform

Alternatives to: Medium

Open source	Stars	Private
Sigle		Yes
WriteFreely		-