Retrieval Ranking Fusion RAG Tools

Tools for combining and reranking search results from multiple retrieval methods (BM25, dense vectors, knowledge graphs) using fusion algorithms, ranking models, and ensemble techniques. Does NOT include document chunking, vector databases, or domain-specific applications—only the ranking/fusion layer itself.

There are 62 retrieval ranking fusion tools tracked. 2 score above 70 (verified tier). The highest-rated is HKUDS/LightRAG at 73/100 with 29,302 stars. 5 of the top 10 are actively maintained.

Get all 62 projects as JSON

curl "https://pt-edge.onrender.com/api/v1/datasets/quality?domain=rag&subcategory=retrieval-ranking-fusion&limit=20"

Open to everyone — 100 requests/day, no key needed. Get a free key for 1,000/day.

#	Tool	Score	Tier	Stars	Language
1	HKUDS/LightRAG [EMNLP2025] "LightRAG: Simple and Fast Retrieval-Augmented Generation"	73	Verified	29,302	Python
2	beir-cellar/beir A Heterogeneous Benchmark for Information Retrieval. Easy to use, evaluate...	70	Verified	2,105	Python
3	superlinear-ai/raglite 🥤 RAGLite is a Python toolkit for Retrieval-Augmented Generation (RAG) with...	69	Established	1,146	Python
4	HKUDS/RAG-Anything "RAG-Anything: All-in-One RAG Framework"	69	Established	14,187	Python
5	illuin-tech/vidore-benchmark Vision Document Retrieval (ViDoRe): Benchmark. Evaluation code for the ColPali paper.	64	Established	265	Python
6	DataScienceUIBK/Rankify 🔥 Rankify: A Comprehensive Python Toolkit for Retrieval, Re-Ranking, and...	60	Established	598	Python
7	Raudaschl/rag-fusion RAG-Fusion: multi-query generation + Reciprocal Rank Fusion for better...	59	Established	908	Python
8	xmpuspus/kb-arena Benchmark 7 retrieval strategies on your own docs — naive vector,...	54	Established	6	Python
9	SciPhi-AI/R2R SoTA production-ready AI retrieval system. Agentic Retrieval-Augmented...	51	Established	7,725	Python
10	mixedbread-ai/mxbai-rerank Crispy reranking models by Mixedbread	50	Established	50	Python
11	tangbotony/GraTAG GraTAG — Production AI Search via Graph-Based Query Decomposition and...	46	Emerging	204	Python
12	microsoft/PIKE-RAG PIKE-RAG: sPecIalized KnowledgE and Rationale Augmented Generation	41	Emerging	2,372	Python
13	incidentfox/OpenRag Multi-strategy RAG system achieving 74% Recall@10 on MultiHop-RAG. Combines...	38	Emerging	36	Python
14	Rohith-2/bm25-fusion An ultra-fast BM25 retriever with support for multiple variants and...	38	Emerging	2	Python
15	izikeros/rankflow Library for plotting multiple ranks evolved over processing steps - draw a...	34	Emerging	2	Python
16	ALucek/rag-reranking An overview of popular reranking models and architectures for 2 stage RAG pipelines	33	Emerging	21	Jupyter Notebook
17	spider-hand/tokyo-landprice-rag A Retrieval-Augmented Generation (RAG) application for exploring Tokyo land...	33	Emerging	19	Vue
18	FarhanAliRaza/django-hawkeye Django BM25 full-text search using PostgreSQL - a lightweight Elasticsearch...	32	Emerging	69	Python
19	Beer-Bears/scaffold Structural RAG (Retrieval-Augmented Generation) system for large codebases	30	Emerging	16	Python
20	AIAnytime/Re-ranking-Playground An interactive tool for exploring and comparing 5 different document...	29	Experimental	5	Python
21	Guest400123064/bbm25-haystack Simple Haystack in-memory document store alternative that performs...	28	Experimental	18	Python
22	samadpls/BestRAG BestRAG: A library for hybrid RAG, combining dense, sparse, and late...	28	Experimental	19	Python
23	vblagoje/openapi-rag-service A flexible Haystack 2.0 pipeline integrating Retrieval-Augmented Generation...	26	Experimental	6	Python
24	chu2bard/rankfuse Reranking and result fusion for search and RAG pipelines	24	Experimental	13	Python
25	JhaAyush01/Hybrid-Retrieval-Systems Hybrid Retrieval System combining keyword matching (BM25) with semantic...	24	Experimental	3	Jupyter Notebook
26	Intrinsical-AI/geometric-aware-retrieval-v2 A Python library for geometric-aware information retrieval using...	24	Experimental	1	Python
27	Hanjo92/unity-resource-rag Unity UI asset-aware RAG pipeline with MCP sidecar and UPM tools for...	23	Experimental	1	Python
28	drittich/reciprocal-rank-fusion Allows you to merge search results from multiple search engines using the...	23	Experimental	6	C#
29	wksbx/elastic-graph-rag Hybrid search RAG pipeline combining Elasticsearch (BM25 + vector + RRF)...	23	Experimental	1	Python
30	ForwardCodeSolutions/rag-engine Lightweight hybrid RAG engine with Vector + BM25 + Knowledge Graph search,...	22	Experimental	—	Python
31	Sunnyztj/turboquant-memory TurboQuant (ICLR 2026) vector quantization for memory/RAG embedding...	22	Experimental	—	Python
32	MukundaKatta/HybridFind Hybrid semantic + keyword search — BM25 and vector similarity with...	22	Experimental	—	Python
33	Fingrows/rankfuse 🔥 Enhance search and RAG pipelines by reranking and fusing results with...	22	Experimental	—	Python
34	Klastrovanie/KlastroKnowledge-CUDA A CUDA extension for Mahalanobis distance-based top-K matching,...	22	Experimental	—	Jupyter Notebook
35	Aerendal/ishkarim-rag Hybrid RAG on CPU-only SQLite: FTS5 + embeddings + RRF fusion. 235 knowledge sources.	22	Experimental	—	Python
36	SimonLupart/ikat-baseline TREC iKAT (interactive Knowledge Assistant Track): Baselines Retrieval for...	22	Experimental	4	Python
37	alex-is-busy-coding/speculative-rag An implementation of Speculative RAG exploring latency-quality trade-offs in...	22	Experimental	—	Python
38	ngpepin/mostsimilar-for-RAG-normalization Linux CLI tools to compare text files and find nearest neighbours across...	20	Experimental	1	C
39	ihatesea69/beir-retrieval-benchmark Benchmarking BM25 sparse retrieval vs RAG dense retrieval vs Hybrid (RRF) on...	20	Experimental	1	Python
40	vivek34561/Adaptive-RAG An adaptive Retrieval-Augmented Generation (RAG) system that dynamically...	19	Experimental	—	Jupyter Notebook
41	sankar-ramamoorthy/rag-foundry-docgraph Modular RAG backend for document ingestion, vector search, and deterministic...	19	Experimental	—	Python
42	AyhamJo7/CoRAG This project implements an adaptive, multi-step retrieval system inspired by...	17	Experimental	2	Python
43	paswell-chiks/Optimizing-RAG-with-Hybrid-Search 🔍 Optimize RAG systems by exploring Lexical, Semantic, and Hybrid Search...	16	Experimental	—	Jupyter Notebook
44	MrRezaeiUofT/AT-RAG AT-RAG (Adaptive Retrieval-Augmented Generation) is a novel RAG model...	16	Experimental	10	Python
45	tpancholi/qdrant_rrf_with_filter Data Retrieval from Qdrant Vector DB based on RRF algo and metadata filtering	16	Experimental	1	Jupyter Notebook
46	ksm26/Retrieval-Optimization-From-Tokenization-to-Vector-Quantization The course provides a comprehensive guide to optimizing retrieval systems in...	15	Experimental	2	Jupyter Notebook
47	patelpattu90-ai/hybrid-rag-knowledge-engine Production-style Hybrid RAG system with semantic + keyword retrieval,...	15	Experimental	1	Python
48	Setoju/similarity_search Similarity search using embeddings, BM25 and reranking (RAG)	15	Experimental	1	Ruby
49	btboilerplate/RAG-Systems-Lab A modular RAG experimentation framework benchmarking BM25, vector, hybrid,...	14	Experimental	—	Jupyter Notebook
50	mizamoon/rag-trump-twitter 🧢🇺🇸 Hybrid RAG (BGE-M3 + BM25 + rerank) по постам Трампа из Twitter	14	Experimental	—	Python
51	vanshksingh/Thread-RAG Thread-RAG: Traversal-Heuristic Retrieval for Embedded And Distributed RAG	14	Experimental	—	Python
52	NevroHelios/hierarchical-rag Multi-source Hierarchical RAG with hybrid retrieval (dense + BM25 + RRF),...	14	Experimental	—	Jupyter Notebook
53	svilupp/FlashRank.jl Rapid Document Ranking, Powered by Lightweight Models.	13	Experimental	8	Julia
54	mollyiverson/ACME10-HE-RAGApp Retrieval-Augmented Generation (RAG) chat-box application using Knowledge...	13	Experimental	—	Python
55	patw/BreadRank A small reranker service using mixedbread.ai reranker model	12	Experimental	4	Python
56	RAGE-AI-Enterprise/rage-core R.A.G.E AI Core - RAG-based API platform for enterprise AI tools.	11	Experimental	—	—
57	JitamB/Backstory-Consistency-NLP A RAG-based NLP pipeline that verifies character backstories against entire...	11	Experimental	—	Python
58	Samanosukeh/rag-hybrid-search-multi-query RAG project using Qdrant with hybrid search: dense + sparse vectors	11	Experimental	—	Python
59	rwmicro/rag-backend Service de RAG pour la recherche et la génération de réponses basées sur des...	11	Experimental	—	Python
60	Arnav-Ajay/rag-reranking-playground Controlled experiment isolating reranking as a first-class RAG system...	11	Experimental	—	Python
61	Ezenitac-AiService/Hybrid_RAG API와 설치형 LLM을 이용한 간단한 RAG 시스템 구현을 위한 개발문서	11	Experimental	—	—
62	Arnav-Ajay/rag-hybrid-retrieval A controlled experiment evaluating whether hybrid (dense + sparse) retrieval...	11	Experimental	—	Python

Comparisons in this category

LightRAG and RAG-Anything (73 vs 69) LightRAG and R2R (73 vs 51) LightRAG and raglite (73 vs 69) LightRAG and rag-fusion (73 vs 59) LightRAG and GraTAG (73 vs 46) LightRAG and OpenRag (73 vs 38) raglite and RAG-Anything (69 vs 69) rag-fusion and OpenRag (59 vs 38)