Free and open first
Best LLM Application Development Frameworks in 2026
- 49 apps
- Research read 9 Oct 2026
- How the order is worked out
- 1
Scanopy
Free plan Open source APILinuxMac+3Scanopy focuses on documenting network assets and relationships, with self-hosted and cloud options and plan-dependent sharing tools.
- 2
Vellum
Free plan Open source AndroidAPIExtension+5Vellum offers a personal assistant with saved context, skills, integrations and approval controls.
- 3
Flowise
Free plan APILinuxMac+3Flowise offers visual workflow construction, integrations, and deployment options, but its wind-down is a central consideration.
- 4
CrewAI AMP
Free plan APISelf-hostedWebChoose CrewAI AMP if your team needs several ways to build multi-agent workflows alongside tracing and governance controls.
- 5
LlamaIndex
Free plan APILinuxSelf-hosted+1LlamaIndex combines document parsing, extraction, classification, and retrieval pipelines for teams building document-centered AI workflows.
- 6
Haystack
Free plan APISelf-hostedHaystack provides a free framework for assembling AI systems from modular pipelines, with integrations and self-hosted deployment options.
- 7
LangChain
Free plan APISelf-hostedChoose LangChain to build agents around models and tools using its configurable harness, middleware, and wide range of integrations.
- 8
Langflow
Free plan APILinuxMac+3Langflow offers visual workflow building alongside Python extensibility, API use, and agent and MCP support. Its execution and isolation model requires care, particularly for multi-tenant deployments.
- 9
DSPy
Free plan APISelf-hostedChoose DSPy if you are building AI programs in Python and want task signatures, composable modules, and prompt optimization.
- 10
OpenRAG
Free plan APISelf-hostedWebOpenRAG combines document retrieval, source-linked answers and self-managed deployment in a free framework.
- 11
txtai
Free plan APILinuxMac+2txtai brings search, language model pipelines, workflows, and agents into one open-source framework.
- 12
Pathway Live Data Framework
Free plan APISelf-hostedChoose Pathway if you need Python or SQL pipelines that combine live data processing with analytics or AI tooling.
- 13
AgentScope
Free plan LinuxMacWeb+1 - 14
- 15
Apache Burr
Free plan LinuxMacWindows - 16
AutoGen
Free plan LinuxMacWindows - 17
AWS Strands Agents
Free plan LinuxMacWindows - 18
Genkit
Free plan LinuxMacWeb+1 - 19
Letta
Free plan LinuxMacWeb+1 - 20
BAML
Free plan Web - 21
LangChain4j
Free plan LinuxMacWindows - 22
LMQL
Free plan LinuxMacWeb+1 - 23
NVIDIA NeMo Guardrails
Free plan LinuxMacWindows - 24
Agno
Free plan Web - 25
Langroid
Free plan LinuxMacWindows
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price