List of free collaboration stuff for developerππ½
If you're looking for all programming tools around collaboration (not just free). Check this page List of collaboration Programming Tools

Unlimited Codebases Codebases with up to 3 collaborators Live feedback and suggestions

Cluctch
Clutch helps product teams go from prototype to production in real-time
Tag: product-management, collaboration, nocode
Free during Beta Build real products & components with real-time collaboration Unlimited private and public projects Community support

Onlineboard
Browser based online whiteboard app. Allows you to create a whiteboard where others see everything in real-time as you draw it. Dark mode, no login required, multiple colors, export to PNG.
Tag: remote, productivity, whiteboard, blackboard, multiplayer, collaboration
Dark mode Zoomable board Up to 32 users No signup required Export to PNG Follow your guests on the whiteboard

3 personal projects 1 project collaborator 1 team Unlimited team members 1 team project

Livecycle
Make your pull requests remarkably contextual, collaborative and efficient.
Tag: code-review, collaboration, productivity
Free for up to 5 collaborators. And free forever for open source projects.

Lucidchart
Lucidchart is the intelligent diagramming application where seeing becomes doing. With this intuitive, cloud-based solution, everyone can work visually and collaborate in real time while building flowcharts, mockups, UML diagrams, and more. Sign up for free now.
Tag: thinking, collaboration
Team collaboration 100 Professional templates

Liveblocks
Liveblocks is a set of APIs and tools that helps you create performant and reliable collaborative experiences.
Tag: real-time, collaboration
Unlimited rooms 30 simultaneous connections 5 simultaneous connections per room Community support
SeaTable
SeaTable is the new flexible way for teams to work on tasks, projects or ideas.
Tag: product-management, collaboration, nocode, api, spreadsheet, database, task-management, productivity, remote
Unlimited number of tables 10,000 rows per account 2GB storage for file attachments Up to 25 team members 1 month versioning and snapshots Community support JavaScript and Python support

Pop
Work together like youβre in the same room. Supports Mac, Windows, Linux, iOS, Android, Safari, Firefox & Chrome.
Tag: meetings, remote, screen-sharing, collaboration
Join unlimited meetings High quality screen sharing Remote control Draw / messaging

Figma
Build better products as a team. Design, prototype, and gather feedback all in one place with Figma.
Tag: design, collaboration, alternative
Unlimited files in drafts Unlimited viewers and commenters Unlimited editors on 3 team files 1 team project 30-day version history Unlimited cloud storage

Livecycle
Get PRs reviewed instantly and ship code 10x faster by collaborating on top of ephemeral environments.
Tag: productivity, collaboration, remote, reviews, feedback, Github, pull-request
Free tier: Up to 5 active team members Free forever: For open source projects, unlimited members

Mattermost
Mattermost is an #opensource platform for secure collaboration across the entire software development lifecycle.
Tag: productivity, project-management, collaboration
Unlimited 1:1 and group messaging Unlimited users, channels, teams Unlimited boards One customizable playbook Online and community support