FREEDOM251

Freedom251 › Developer Tools

Free and open first

Best Distributed Systems in 2026

  1. 1

    Aerospike Database

    by Aerospike Database
    Free plan Open source APILinuxMac+3

    Aerospike Database offers multiple data models, storage choices, and replication modes in one engine. Check edition support and licensing notes for connectors and security features when assessing fit.

    9.3 Free plan Visit site
  2. 2

    Apache Cassandra

    by Apache Cassandra
    Free plan Open source APILinuxMac+3

    Cassandra offers a distributed, self-managed database with multiple deployment options and tunable consistency.

    9.3 Open source Visit site
  3. 3

    Apache Ignite

    Free plan Open source APILinuxMac+2

    Choose Apache Ignite if you need a free, open-source distributed database with SQL, partition-spanning transactions, and an in-memory primary tier.

    9.2 Open source Visit site
  4. 4

    Apache RocketMQ

    Free plan Open source APILinuxMac+2

    Apache RocketMQ offers a broad set of messaging patterns and deployment options as self-hosted open-source middleware.

    9.1 Open source Visit site
  5. 5

    Kuma

    Free plan Open source APILinuxMac+2

    Kuma offers traffic management, security, and observability features across several deployment environments. Note that it is self-hosted and the GUI is read-only in the Kubernetes quickstart.

    8.8 Open source Visit site
  6. 6

    RabbitMQ

    Free plan Open source APILinuxMac+3

    RabbitMQ combines multiple messaging patterns and protocols with configurable delivery guarantees and deployment options.

    8.7 Free plan Visit site
  7. 7

    TiDB Cloud

    by TiDB Cloud
    Free plan Open source APILinuxSelf-hosted+1

    TiDB Cloud pairs managed database hosting with a free Starter quota and support for transactional and analytical workloads.

    8.6 Free plan Visit site
  8. 8

    Apache Flink

    Free plan APILinuxSelf-hosted

    Apache Flink offers stream and batch processing APIs with operational capabilities for self-hosted deployments.

    7.5 Free plan Visit site
  9. 9

    Apache Pulsar

    Free plan APILinuxMac+2

    Apache Pulsar combines messaging, streaming, connectors and serverless processing in a self-hosted platform.

    7.5 Free plan Visit site
  10. 10

    etcd

    Free plan APILinuxMac+2

    etcd provides self-hosted distributed storage with watches, expiry and failure tolerance, and is central to Kubernetes.

    7.4 Open source Visit site
  11. 11

    Apache Kafka

    Free plan APISelf-hosted

    Choose Apache Kafka if you need a free, open-source stream-processing system that supports stateful processing and event-time windows and can be self-hosted.

    7.3 Open source Visit site
  12. 12

    Honeycomb

    Free plan AndroidAPIiPhone+2

    Honeycomb combines telemetry ingestion with investigation tools for tracing and related data. Free has stated monthly data allowances; larger deployments can consider Pro or custom Enterprise plans.

    7.3 Free plan · paid from $150/mo Visit site
  13. 13

    Jaeger

    Free plan APILinuxMac+3

    Jaeger provides distributed tracing, service graphs, and trace-derived performance metrics as a self-hosted open-source project.

    7.3 Free plan Visit site
  14. 14

    Apache Doris

    Free plan APILinuxSelf-hosted

    Choose Apache Doris if you need an open-source analytical database for real-time analytics, lakehouse querying, or AI workloads, with SQL, search, and detailed access controls.

    7.2 Free plan Visit site
  15. 15

    CockroachDB Cloud

    by CockroachDB Cloud
    Free plan APILinuxWeb

    CockroachDB Cloud combines managed operations with distributed SQL and deployments across regions and cloud providers.

    7.2 From $0.06 · 30-day trial Visit site
  16. 16

    Cilium

    Free plan LinuxSelf-hosted

    Cilium brings networking, policy, security, and observability features together for Linux workload environments. Check kernel and scale requirements before choosing an installation path.

    7.1 Open source Visit site
  17. 17

    Istio

    Free plan LinuxMacSelf-hosted

    Istio combines traffic management, security, and observability for distributed workloads, with sidecar and ambient deployment choices.

    7.1 Free plan Visit site
  18. 18

    Redpanda

    Free plan APILinuxMac+3

    Choose Redpanda if your team needs replayable event streams through a Kafka-compatible API and wants managed or self-managed deployment choices.

    7.1 30-day trial Visit site
  19. 19

    FoundationDB

    Free plan APILinuxMac+2

    Choose FoundationDB if you need an open-source distributed key-value database with cross-machine ACID transactions and fault handling.

    7.0 Open source Visit site
  20. 20

    NATS

    Free plan APILinuxSelf-hosted

    Choose NATS if you need open-source messaging for distributed services and want pub/sub, request/reply, and persistent streaming in one system.

    7.0 Open source Visit site
  21. 21

    Temporal

    Free plan APILinuxMac+3

    Temporal focuses on durable execution for long-running and failure-prone workflows, with both self-hosted and cloud deployment options.

    7.0 Free plan · paid from $50 Visit site
  22. 22

    Linkerd

    Free plan LinuxSelf-hosted

    Linkerd offers traffic management, observability, and security for Kubernetes without requiring code changes.

    6.9 Free plan Visit site
  23. 23

    OpenZipkin

    Free plan Self-hostedWeb

    OpenZipkin provides trace search, summaries, and a service dependency diagram for self-hosted latency investigation.

    6.8 Free plan Visit site
  24. 24

    YDB

    Free plan APILinuxSelf-hosted

    YDB spans transactional, analytical and streaming use cases, with both self-hosted and cloud deployment options.

    6.8 Open source Visit site
  25. 25

    Apache ServiceComb

    Free plan LinuxWindows
    6.1 Free plan Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

More in Developer Tools