This week in COSS: Dash0 acquired Polar Signals, while Stripe reportedly reached a deal to acquire OpenRouter for more than $7 billion; Dynatrace acquired Arize, and Databricks acquired Electric. Temporal is reported to be in talks to raise about $500 million at a $12 billion pre-money valuation, and Synthefy announced a $6.5 million seed round led by Wing Venture Capital.
In other news, Modular made the Mojo programming language fully open source under Apache 2.0 with LLVM exceptions; TrueFoundry launched TrueForge, an open-source, vendor-neutral alternative to Claude Managed Agents; and DeepSeek launched its MIT-licensed, plugin-based agent harness alongside DeepSeek-V4-Pro.
We also feature the following companies in Cossmology: Akon Labs, CrewAI, Predibase, Resemble AI, Sourcegraph, Synthefy, TrueFoundry, VeloDB, VictoriaMetrics, and ZenStack.
COSS Headlines
Electric joins Databricks to bring WASM Postgres to AI agent sandboxes
Companies mentioned: Databricks, ElectricSQL
Announcement · Databricks Blog
DeepSeek open sources an agent harness where everything is a plugin
Companies mentioned: DeepSeek
Announcement · The New Stack
Stripe will reportedly acquire AI gateway startup OpenRouter for $7B+
Companies mentioned: OpenRouter
Announcement · TechCrunch
Mojo is now open source!
Companies mentioned: Modular
Announcement · Modular Blog
Temporal in talks for $500M round at $12B, six months after $300M raise
Companies mentioned: Temporal
Funding · Dealroom
Dash0 Acquires Polar Signals
Companies mentioned: Polar Signals, Dash0
Announcement · Dash0 Blog
Arize Acquired By Dynatrace
Companies mentioned: Arize AI
Announcement · Arize Blog
Synthefy: Announcing our $6.5M Seed Round
Companies mentioned: Synthefy
Funding · Synthefy Blog
An open source rival to Claude Managed Agents just launched
Companies mentioned: TrueFoundry
Announcement · The New Stack
DeepSeek Harness launches as open source rival to Claude Code, alongside V4-Pro on API with higher prices
Companies mentioned: DeepSeek
Announcement · VentureBeat
Featured COSS Companies
Synthefy
Tabular data prediction models
TrueFoundry
Enterprise AI gateway for LLMs and agents
Akon Labs
Code intelligence engine for AI agents
VictoriaMetrics
Open-source time series database & monitoring
Sourcegraph
AI SDLC platform for code search & editing
Predibase
Platform for fine-tuning large language models
CrewAI
Platform for building AI agent workflows
Resemble AI
Voice AI platform for generation & detection
VeloDB
Real-time data warehouse for fast analytics.
ZenStack
Full-Stack Toolkit with Authorization on Prisma ORM
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