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Perhaps upspin, it's written by some of the primary Go contributors itself.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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I've tried to write https://github.com/ptman/urlredir as educational code. It's a bit dated, but at least simple. Feedback welcome.
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I've also wrapped that project into a GitHub action which is also written in Go, and is low LOC https://github.com/jimschubert/beast-changelog-action
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https://github.com/pkg/errors - errors with stack traces
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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koanf
Simple, extremely lightweight, extensible, configuration management library for Go. Supports JSON, TOML, YAML, env, command line, file, S3 etc. Alternative to viper.
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https://github.com/jessevdk/go-flags - struct based flag parsing
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https://github.com/hashicorp/vault - secret management
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consul
Consul is a distributed, highly available, and data center aware solution to connect and configure applications across dynamic, distributed infrastructure.
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Ory Hydra
The only web-scale, fully customizable OpenID Certified™ OpenID Connect and OAuth2 Provider in the world. Become an OpenID Connect and OAuth2 Provider over night. Written in Go, cloud native, headless, API-first. Available as a service on Ory Network and for self-hosters. Relied upon by OpenAI and others for web-scale security.
https://github.com/ory/hydra - extensible OIDC provider
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Ory Kratos
Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Factor Auth, SMS, SAML, TOTP, and more. Runs everywhere, runs best on Ory Network. (by ory)
https://github.com/ory/kratos - generic user management
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https://github.com/goharbor/harbor - docker registry
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https://github.com/rancher/rancher - container management platform
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https://github.com/ethereum/go-ethereum - ethereum client
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I really liked the prometheus codebase when I was contributing to a fork of it once.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives