Open source focus

Open Source Alternatives to Guerrero

25 open source Email Service options similar to Guerrero, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Each profile notes license and self-hosting where we have it.

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Hyst8
Digital Asset ManagementLondon, United Kingdom
A platform for managing and sharing digital assets and content.
Open source
Backblaze73
SaaSSan Mateo, United States$13.0M
Provides affordable, S3-compatible cloud object storage and automated computer backup services for businesses and individuals.
Open source
ClickUp67
Project ManagementSan Francisco, United States$531.5M
ClickUp is a cloud-based productivity and collaboration platform offering task management, project management, and time tracking features.
Open source
Gitpod64
Developer ToolsTübingen, Germany$28.0M
Cloud Development Environments for efficient and secure team software development.
Open source · Self-hostable
Vultr63
NeocloudHerndon, United States$662.0M
Global GPU cloud infrastructure
Open source
Pitch62
Presentation SoftwareBerlin, Germany$73.0M
Collaborative pitch deck and presentation software for modern teams.
Open source
Nasuni61
SaaSBoston, United States$219.0M
A hybrid cloud file data platform providing unified storage, protection, and management for enterprises.
Open source
Cardano55
Blockchain
A secure, scalable, and sustainable proof-of-stake blockchain platform for decentralized applications and smart contracts.
Open source · Self-hostable
Slido55
Event TechBratislava, Slovakia
Interactive Q&A, polls, and presentation sharing for events and meetings.
Open source
Superlist55
Productivity SoftwareBerlin, Germany$14.4M
AI-powered task management and note-taking app for individuals and teams.
Open source
ENS (Ethereum Name Service)53
Web3$1.0M
Decentralized naming system for the Ethereum blockchain, mapping human-readable names to Ethereum addresses and Web3 resources.
Open source
Plane53
Project ManagementSan Francisco, United States$4.0M
AI-native platform unifying project management, documentation, and workflows.
Open source
Officevibe53
HR TechMontreal, Canada$32.0M
Employee engagement and feedback platform for improving workplace culture and performance.
Open source
CO
CodeSandbox51
Developer ToolsAmsterdam, Netherlands$15.2M
Instant cloud development environments for coding, collaboration, and AI agent execution.
Open source
Code Input43
Developer Tools$6.5M
Web-native developer productivity suite for high-velocity software delivery teams.
Open source
Storj41
Cloud StorageAtlanta, United States$973.0M
Decentralized cloud object storage platform for developers, offering secure, private, and cost-effective storage.
Open source
DreamHost38
Web HostingBrea, United States$51.0M
Web hosting provider offering a range of services from shared hosting to cloud computing and managed WordPress.
Open source · Self-hostable
Provengo34
EnterpriseTel Aviv, Israel
Automates and synthesizes product definition interactions and communications for software development teams.
Open source
AOL32
Internet Service ProviderNew York, United States$28.0M
A former internet giant offering email, news, and online services.
Open source
Virtual Vision31
Spatial Computing & XRMontreal, Canada
AI-powered platform for creating and managing virtual environments for training and collaboration.
Open source
Justdocs15
Enterprise Software
A centralized, searchable, and permissioned platform for managing documentation, runbooks, and sensitive information.
Open source
Certun10
Identity Verification
AI-powered platform for automating and securing digital identity verification and compliance.
Open source
Persondb8
Personal Data Management
AI-powered knowledge graph for personal data management and intelligent applications.
Open source
Llmkb7
Knowledge Management
Self-hosted knowledge-graph wiki platform for teams.
Open source
Fed Labs
Digital Identity
Engineering systems that shape digital identity.
Open source

Company	Sector	License	HQ	Funding	Score
HystA platform for managing and sharing digital assets and content.	Digital Asset Management	Open source	London, United Kingdom	—	8
BackblazeProvides affordable, S3-compatible cloud object storage and automated computer backup services for businesses and individuals.	SaaS	Open source	San Mateo, United States	$13.0M	73
ClickUpClickUp is a cloud-based productivity and collaboration platform offering task management, project management, and time tracking features.	Project Management	Open source	San Francisco, United States	$531.5M	67
GitpodCloud Development Environments for efficient and secure team software development.	Developer Tools	Open source · Self-hostable	Tübingen, Germany	$28.0M	64
VultrGlobal GPU cloud infrastructure	Neocloud	Open source	Herndon, United States	$662.0M	63
PitchCollaborative pitch deck and presentation software for modern teams.	Presentation Software	Open source	Berlin, Germany	$73.0M	62
NasuniA hybrid cloud file data platform providing unified storage, protection, and management for enterprises.	SaaS	Open source	Boston, United States	$219.0M	61
CardanoA secure, scalable, and sustainable proof-of-stake blockchain platform for decentralized applications and smart contracts.	Blockchain	Open source · Self-hostable	—	—	55
SlidoInteractive Q&A, polls, and presentation sharing for events and meetings.	Event Tech	Open source	Bratislava, Slovakia	—	55
SuperlistAI-powered task management and note-taking app for individuals and teams.	Productivity Software	Open source	Berlin, Germany	$14.4M	55
ENS (Ethereum Name Service)Decentralized naming system for the Ethereum blockchain, mapping human-readable names to Ethereum addresses and Web3 resources.	Web3	Open source	—	$1.0M	53
PlaneAI-native platform unifying project management, documentation, and workflows.	Project Management	Open source	San Francisco, United States	$4.0M	53
OfficevibeEmployee engagement and feedback platform for improving workplace culture and performance.	HR Tech	Open source	Montreal, Canada	$32.0M	53
COCodeSandboxInstant cloud development environments for coding, collaboration, and AI agent execution.	Developer Tools	Open source	Amsterdam, Netherlands	$15.2M	51
Code InputWeb-native developer productivity suite for high-velocity software delivery teams.	Developer Tools	Open source	—	$6.5M	43
StorjDecentralized cloud object storage platform for developers, offering secure, private, and cost-effective storage.	Cloud Storage	Open source	Atlanta, United States	$973.0M	41
DreamHostWeb hosting provider offering a range of services from shared hosting to cloud computing and managed WordPress.	Web Hosting	Open source · Self-hostable	Brea, United States	$51.0M	38
ProvengoAutomates and synthesizes product definition interactions and communications for software development teams.	Enterprise	Open source	Tel Aviv, Israel	—	34
AOLA former internet giant offering email, news, and online services.	Internet Service Provider	Open source	New York, United States	$28.0M	32
Virtual VisionAI-powered platform for creating and managing virtual environments for training and collaboration.	Spatial Computing & XR	Open source	Montreal, Canada	—	31
JustdocsA centralized, searchable, and permissioned platform for managing documentation, runbooks, and sensitive information.	Enterprise Software	Open source	—	—	15
CertunAI-powered platform for automating and securing digital identity verification and compliance.	Identity Verification	Open source	—	—	10
PersondbAI-powered knowledge graph for personal data management and intelligent applications.	Personal Data Management	Open source	—	—	8
LlmkbSelf-hosted knowledge-graph wiki platform for teams.	Knowledge Management	Open source	—	—	7
Fed LabsEngineering systems that shape digital identity.	Digital Identity	Open source	—	—	—