Dev tools · alternatives · 2026

24 alternatives to Gmax CRM Open Source

Gmax CRM is an open source invoicing software

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Gmax CRM Open Source launched in 2022; newer entries below may have overtaken it.

1
Twenty▲991
The #1 open-source CRM
2025 · twenty.com · its alternatives →
2IM
I'm working on an open-source Gmail replacement▲387
2013 · khamidou.github.io · its alternatives →
3
Gmax CRM Lite▲4
Invoicing tool For Small Businesses & Freelancers
2021 · its alternatives →
4
Micro CRM for Gmail▲122
Write private notes with a lightweight CRM for Gmail
2022 · its alternatives →
5
NetHunt CRM▲142
Turn Gmail into a smart CRM
2016 · its alternatives →
6
ClearCRM▲380
Comprehensive CRM Suite with built-in automation builder
2025 · its alternatives →
7
FollowUp Personal CRM▲205
The personal CRM for Gmail
2017 · its alternatives →
8
Pigeon for Gmail▲427
Mail merge, auto follow ups, CRM inside your Gmail
2021 · its alternatives →
9OO
Openkoda – Open–source, private, Salesforce alternative▲318
2024 · github.com · its alternatives →
10
Atomic CRM▲157
The open-source CRM toolkit for personalized solutions
2024 · its alternatives →
11
Hexospark▲204
Email automation + CRM designed to spark conversations
2022 · its alternatives →
12OS
Open-Sourcing InboxSDK (YC S11) – Build Apps in Gmail▲257
Hi HN! We’re Aleem, Chris, Borys, Meichen and Zach from Streak (YC S11) and today we’re open sourcing our InboxSDK https://www.inboxsdk.com, which makes it easy to build apps for Gmail. Over 1.8B users spend their days in Gmail! Having your app built into the Gmail workflow is a better user experience and gives you great user retention. InboxSDK gives you a high-level, declarative API to insert your UI into Gmail without having to directly manipulate the DOM yourself. End users install a browser extension to use your app. The SDK can add UI to multiple areas of Gmail. For example,…
2022 · its alternatives →
13
Crank CRM▲82
The scalable toolkit for small businesses
2021 · its alternatives →
14
Gmail CoPilot by cloudHQ▲122
An easy CRM in your inbox
2019 · its alternatives →
15MC
Micro CRM, a CRM for People Who Hate CRMs▲147
Hello Community! My name is Charles-Eugene Loubao, I am a software developer who recently turned into an Indie Maker and I am sharing my new product with you today. Micro CRM is a Customer Relationship Managment web app built to be easy to use and intuitive. Most CRMs can be complicated to use and come with an expensive price tag. Micro CRM is built to fill that need for a much simpler and cheaper contact managment platform that offers compeling features without being overwhelming. What can I do with it ? - Keep all your contacts in one place - Timestamped notes can be used to keep track of…
2019 · its alternatives →
16
NetHunt▲69
Built-in-Gmail CRM for sales teams and small businesses
2019 · its alternatives →
17
Copper CRM▲118
The #1 CRM for customers who love Google.
2018 · its alternatives →
18
Sheetify CRM▲96
Ultimate Google Sheets CRM, sales & task management toolkit
2023 · its alternatives →
19
CRM Pipeline▲7
Your CRM, your pipeline, your way
Oct 2025 · github.com · its alternatives →
20
simpleleads▲69
Ultra-simple lead & experience management CRM tool
2022 · its alternatives →
21WA
We are building an open-source Salesforce▲17
2024 · github.com · its alternatives →
22
Emailgurus - Open Source▲111
Keep your Gmail inbox focused on people you know
2022 · its alternatives →
23
ozma.io▲117
Low-code platform for CRM and ERP solutions
2022 · its alternatives →
24
AntEater▲65
Team CRM on Gmail/Outlook & Slack always up-to-date using AI
2019 · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →