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Elasticsearch

Elastic N.V. · Vector databases

In-depth entry

Distributed search and analytics engine on Apache Lucene with full-text, aggregations, vector search and ES|QL; triple-licensed AGPL, SSPL and Elastic License

AGPL-3.0-only OR SSPL-1.0 OR Elastic-2.0Open sourceFreeSelf-hostedNov 2, 2026

HashiCorp Vault

HashiCorp (an IBM company) · Secrets management

Identity-based secrets manager providing encrypted key-value storage, dynamic database and cloud credentials, PKI and encryption-as-a-service, under the Business Source License

BUSL-1.1FreePaidSelf-hostedNov 2, 2026

Kubernetes

Cloud Native Computing Foundation · Containers & virtualization

In-depth entry

Open-source system for scheduling, scaling and operating containerized workloads across a cluster of machines

Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026

Let's Encrypt

Internet Security Research Group (ISRG) · DNS & domains

In-depth entry

Nonprofit certificate authority that issues free, automatically renewable TLS certificates through the ACME protocol

MPL-2.0FreeNov 2, 2026

OpenSearch

OpenSearch Software Foundation (Linux Foundation) · Vector databases

Apache-2.0 search and analytics suite forked from Elasticsearch and Kibana, governed by the OpenSearch Software Foundation

Apache-2.0Open sourceFreeSelf-hostedBroken

promptfoo

Promptfoo, Inc. · Prompting, evaluation & observability

Open-source, local-first CLI and library for evaluating prompts, models, RAG pipelines and agents, with automated red teaming and CI integration

MITOpen sourceFreeLocalSelf-hostedBroken

Terraform

HashiCorp (an IBM company) · Infrastructure & provisioning

Infrastructure-as-code tool that provisions cloud and SaaS resources from HCL configurations through a plan-and-apply workflow, licensed under BSL 1.1

BUSL-1.1FreePaidLocalNov 2, 2026

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