List of free collaboration stuff for developer๐๐ฝ
If you're looking for all programming tools around collaboration (not just free). Check this page List of collaboration Programming Tools

Teamhood
Teamhood: a powerful visual work collaboration platform for medium to large businesses to manage & execute project work, with advanced Kanban Boards.
Tag: project-management, collaboration, kanban
Unlimited users and all task management features. Kanban gantt timelines time tracking Cloud hosted solution File upload up to 100mb

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

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

Pop
Work together like youโre 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

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
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

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

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

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.

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

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

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