Container Tools

4 open source tools compared. Sorted by stars — scroll down for our analysis.

Tool	Stars	Velocity	Language	License	Score
Dive Explore layers in a Docker image	53.7k	+36/wk	Go	MIT License	82
Portainer Docker and Kubernetes management UI	37.1k	+82/wk	TypeScript	zlib License	79
Colima Container runtimes on macOS with minimal setup	28.0k	+167/wk	Go	MIT License	77
Harbor Trusted cloud native container registry	27.9k	+57/wk	Go	Apache License 2.0	79

Our Analysis

Dive53.7k★

Discord.js is the most popular Node.js library for building Discord bots, wrapping Discord's API into an object-oriented interface with full TypeScript support. It's a terminal UI that lets you browse every file in every layer of a Docker image, see what was added/modified/removed, and spot wasted space. MIT license, written in Go. Run `dive your-image:tag` and get an interactive view: layers on the left, filesystem on the right. It highlights files that exist in one layer but get deleted in a later one (wasted space). Shows you the efficiency score of your image. Works in CI too. Set a threshold and fail the build if the image is too bloated. Fully free. Single binary, no paid tier, no service component. Every developer who builds Docker images should have this installed. The insight is immediate. You'll find multi-megabyte temp files, package manager caches, and build artifacts sitting in intermediate layers that you thought your `RUN rm` cleaned up (it didn't; each layer is immutable). The catch: Dive shows you the problem but doesn't fix it. You still need to restructure your Dockerfile: multi-stage builds, combined RUN commands.dockerignore. And the TUI can be slow on very large images (5GB+). But for diagnosing bloat, nothing else comes close.

Portainer37.1k★

Portainer gives you a web UI for container management, especially useful when your team includes people who shouldn't need to SSH into servers. Deploy, stop, restart, inspect logs, manage volumes and networks, all from a browser. Supports Docker standalone, Docker Swarm, and Kubernetes. The Community Edition (CE) is free and covers single-environment management with full container lifecycle controls, image management, and stack deployment via docker-compose. Business Edition starts at $5/node/month (minimum 5 nodes, annual billing). Adds RBAC, registry management, GitOps deployments, multiple environment management from one dashboard, and support SLA. Enterprise: custom pricing with SSO, audit logging. Solo developers: CE is perfect. Managing a few Docker hosts through a web UI instead of SSH makes life better. Small teams: CE still works: one environment, full access for everyone. Medium teams: Business Edition at $5/node/mo when you need RBAC (who can deploy to production vs staging) or centralized management of multiple environments. Large orgs: Enterprise for SSO and audit trails. The catch: Portainer CE is limited to managing one environment at a time. If you have staging + production + dev, the free tier makes you switch between them. Business Edition connects them all in one dashboard. Also, experienced Docker/K8s users often find the UI slower than CLI; Portainer is most valuable for mixed teams where not everyone lives in the terminal.

Colima28.0k★

That's it. Docker, containerd, and Kubernetes, running on your Mac without the Docker Desktop license headache. (one of the fastest in this batch), MIT license, Go. Uses Lima (Linux virtual machines on macOS) under the hood. Supports Docker and containerd runtimes, Kubernetes via k3s, volume mounts, port forwarding, and custom VM resources. Works on both Intel and Apple Silicon. Fully free. No paid tier, no license restrictions. Docker Desktop requires a paid subscription for companies with 250+ employees or $10M+ revenue. Colima has no such restriction. Every Mac developer who uses Docker: try this. Solo: `brew install colima && colima start` and you're running containers. Small to large teams: eliminates Docker Desktop licensing entirely. The only question is compatibility. The catch: it's a VM-based approach, so file system performance on mounted volumes is slower than native. Some Docker Desktop features (the GUI, Extensions, Dev Environments) don't exist. If you rely on Docker Desktop's graphical interface, you'll miss it. And edge cases with networking or volume mounts occasionally require troubleshooting that Docker Desktop handles silently.

Harbor27.9k★

Harbor is an enterprise-grade container registry you host yourself. Harbor does what Docker Hub does, but on your infrastructure. Push images, pull images, scan them for CVEs (Trivy integration), sign them (Cosign/Notary), replicate them across registries, and control who can access what with RBAC. It's a CNCF graduated project used by serious Kubernetes operations. This is production infrastructure, not a toy. Completely free. Apache 2.0 license. No paid tier. Small teams running Kubernetes in production who need image security (vulnerability scanning, access control) should seriously consider Harbor. The alternative is trusting Docker Hub or paying for a cloud registry. The catch: Harbor is not lightweight. It runs PostgreSQL, Redis, and several microservices. Minimum recommended is 4 GB RAM and 2 CPUs. Setup is doable with Docker Compose or Helm, but maintaining it (backups, upgrades, storage management) is real ops work.