COSS Weekly - Week of April 13, 2026 - Chinstrap Community

COSS Weekly – Week of April 13, 2026

Sabir Ibrahim

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This week in COSS: Mastra raised a $22M Series A to help developers build agents, GitButler secured $17M to build the next generation of Git, and 21st.dev raised $4.5M for an AI component marketplace. Supabase hit 100,000 GitHub stars, Delve’s reputation continues to deteriorate, and Bluesky adds more customization. We also welcome ten new companies to Cossmology: FerretDB, Imgbot, Infracost, Nozbe, OceanBase, Qlty Software, Sourcery, Tiger Data, Tile38, and Vesoft.

COSS Headlines

21st.dev raises $4.5M to build an AI component marketplace for developers

Companies mentioned: 21st.dev

Funding TechCrunch

The end of ‘shadow AI’ at enterprises? Kilo launches KiloClaw for Organizations to enable secure AI agents at scale

Companies mentioned: Kilo Code

Announcement VentureBeat

The reputation of troubled YC startup Delve has gotten even worse

Companies mentioned: Sim

Media Mention TechCrunch

Vercel CEO says AI agents are turning us all into ‘mini CEOs’

Companies mentioned: Vercel

OSS News & Views AOL

Why ‘curate first, annotate smarter’ is reshaping computer vision development

Companies mentioned: Voxel51

OSS News & Views InfoWorld

In-depth: How DeepSeek V4 strengthens Huawei’s role in China’s AI stack

Companies mentioned: DeepSeek

Announcement DIGITIMES

100,000 GitHub stars

Companies mentioned: Supabase

Announcement Supabase Blog

Two Years of Valkey

Companies mentioned: Aiven

Media Mention RedMonk

Naseej and Couchbase Partner to Power Real-Time, High-Performance Applications in KSA

Companies mentioned: Couchbase

Announcement Naseej

Coder secures $90M investment to optimize development environments

Companies mentioned: Coder

Funding SiliconANGLE

Kestra raises €21 million to become the enterprise standard for workflow orchestration

Companies mentioned: Kestra

Funding Sesamers

Bluesky built a new AI tool that wants to free you from social algorithms

Companies mentioned: Bluesky

Announcement Yahoo Tech

I tested Claude Code against 3 open-source alternatives, and one came surprisingly close

Companies mentioned: Anomaly, Cline

Media Mention xda-developers.com

The Document Foundation Removes Dozens of Collabora Developers

Companies mentioned: Collabora

OSS News & Views Slashdot

We’ve raised $17M to build what comes after Git

Companies mentioned: GitButler

Funding GitButler Blog

Lyzr AI Secures Series A+ Funding at $250 Million Valuation …

Companies mentioned: Lyzr

Funding app.com

We raised a $22M Series A to help every developer build agents

Companies mentioned: Mastra

Funding Mastra Blog

More COSS Headlines →

Featured COSS Companies

Open-source MongoDB alternative on Postgres

AI-powered code quality & coverage platform

Automatic image compression GitHub app

Distributed relational database for HTAP

AI-powered automated code reviews

Nozbe

Project management app for small teams

In-memory geospatial database & geofencing

Distributed open-source graph database

PostgreSQL platform for time-series data

$Infracost$

Cloud cost management and FinOps for engineers.

More COSS Companies →

Sabir is an attorney, entrepreneur, and expert on COSS. In his roles as corporate counsel at Amazon and Roku and associate at Greenberg Traurig, he advised nearly all of the Big Five technology companies on complex open source matters. Currently, he is founder and managing attorney of OptimEdge Legal, where he advises technology clients of all sizes on matters related to open source and other technology law issues.

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