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 63 retrieval ranking fusion tools tracked. 1 score above 70 (verified tier). The highest-rated is HKUDS/LightRAG at 70/100 with 29,302 stars. 2 of the top 10 are actively maintained.

Get all 63 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"	70	Verified	29,302	Python
2	beir-cellar/beir A Heterogeneous Benchmark for Information Retrieval. Easy to use, evaluate...	67	Established	2,105	Python
3	HKUDS/RAG-Anything "RAG-Anything: All-in-One RAG Framework"	66	Established	14,187	Python
4	superlinear-ai/raglite 🥤 RAGLite is a Python toolkit for Retrieval-Augmented Generation (RAG) with...	63	Established	1,146	Python
5	illuin-tech/vidore-benchmark Vision Document Retrieval (ViDoRe): Benchmark. Evaluation code for the ColPali paper.	63	Established	265	Python
6	DataScienceUIBK/Rankify 🔥 Rankify: A Comprehensive Python Toolkit for Retrieval, Re-Ranking, and...	56	Established	598	Python
7	Raudaschl/rag-fusion RAG-Fusion: multi-query generation + Reciprocal Rank Fusion for better...	56	Established	908	Python
8	SciPhi-AI/R2R SoTA production-ready AI retrieval system. Agentic Retrieval-Augmented...	51	Established	7,725	Python
9	microsoft/PIKE-RAG PIKE-RAG: sPecIalized KnowledgE and Rationale Augmented Generation	48	Emerging	2,372	Python
10	xmpuspus/kb-arena Benchmark 7 retrieval strategies on your own docs — naive vector,...	48	Emerging	6	Python
11	mixedbread-ai/mxbai-rerank Crispy reranking models by Mixedbread	48	Emerging	50	Python
12	tangbotony/GraTAG GraTAG — Production AI Search via Graph-Based Query Decomposition and...	48	Emerging	204	Python
13	incidentfox/OpenRag Multi-strategy RAG system achieving 74% Recall@10 on MultiHop-RAG. Combines...	40	Emerging	36	Python
14	ALucek/rag-reranking An overview of popular reranking models and architectures for 2 stage RAG pipelines	39	Emerging	21	Jupyter Notebook
15	spider-hand/tokyo-landprice-rag A Retrieval-Augmented Generation (RAG) application for exploring Tokyo land...	37	Emerging	19	Vue
16	izikeros/rankflow Library for plotting multiple ranks evolved over processing steps - draw a...	37	Emerging	2	Python
17	Beer-Bears/scaffold Structural RAG (Retrieval-Augmented Generation) system for large codebases	36	Emerging	16	Python
18	AIAnytime/Re-ranking-Playground An interactive tool for exploring and comparing 5 different document...	35	Emerging	5	Python
19	vblagoje/openapi-rag-service A flexible Haystack 2.0 pipeline integrating Retrieval-Augmented Generation...	33	Emerging	6	Python
20	FarhanAliRaza/django-hawkeye Django BM25 full-text search using PostgreSQL - a lightweight Elasticsearch...	32	Emerging	69	Python
21	samadpls/BestRAG BestRAG: A library for hybrid RAG, combining dense, sparse, and late...	31	Emerging	19	Python
22	Guest400123064/bbm25-haystack Simple Haystack in-memory document store alternative that performs...	31	Emerging	18	Python
23	drittich/reciprocal-rank-fusion Allows you to merge search results from multiple search engines using the...	30	Emerging	6	C#
24	SimonLupart/ikat-baseline TREC iKAT (interactive Knowledge Assistant Track): Baselines Retrieval for...	28	Experimental	4	Python
25	chu2bard/rankfuse Reranking and result fusion for search and RAG pipelines	26	Experimental	13	Python
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	wksbx/elastic-graph-rag Hybrid search RAG pipeline combining Elasticsearch (BM25 + vector + RRF)...	23	Experimental	1	Python
29	AyhamJo7/CoRAG This project implements an adaptive, multi-step retrieval system inspired by...	23	Experimental	2	Python
30	MrRezaeiUofT/AT-RAG AT-RAG (Adaptive Retrieval-Augmented Generation) is a novel RAG model...	23	Experimental	10	Python
31	Klastrovanie/KlastroKnowledge-CUDA A CUDA extension for Mahalanobis distance-based top-K matching,...	22	Experimental	—	Jupyter Notebook
32	Fingrows/rankfuse 🔥 Enhance search and RAG pipelines by reranking and fusing results with...	22	Experimental	—	Python
33	Sunnyztj/turboquant-memory TurboQuant (ICLR 2026) vector quantization for memory/RAG embedding...	22	Experimental	—	Python
34	ForwardCodeSolutions/rag-engine Lightweight hybrid RAG engine with Vector + BM25 + Knowledge Graph search,...	22	Experimental	—	Python
35	ngpepin/mostsimilar-for-RAG-normalization Linux CLI tools to compare text files and find nearest neighbours across...	22	Experimental	1	C
36	ihatesea69/beir-retrieval-benchmark Benchmarking BM25 sparse retrieval vs RAG dense retrieval vs Hybrid (RRF) on...	22	Experimental	1	Python
37	ksm26/Retrieval-Optimization-From-Tokenization-to-Vector-Quantization The course provides a comprehensive guide to optimizing retrieval systems in...	22	Experimental	2	Jupyter Notebook
38	sankar-ramamoorthy/rag-foundry-docgraph Modular RAG backend for document ingestion, vector search, and deterministic...	21	Experimental	—	Python
39	vivek34561/Adaptive-RAG An adaptive Retrieval-Augmented Generation (RAG) system that dynamically...	21	Experimental	—	Jupyter Notebook
40	alex-is-busy-coding/speculative-rag An implementation of Speculative RAG exploring latency-quality trade-offs in...	21	Experimental	—	Python
41	tpancholi/qdrant_rrf_with_filter Data Retrieval from Qdrant Vector DB based on RRF algo and metadata filtering	20	Experimental	1	Jupyter Notebook
42	svilupp/FlashRank.jl Rapid Document Ranking, Powered by Lightweight Models.	20	Experimental	8	Julia
43	patw/BreadRank A small reranker service using mixedbread.ai reranker model	19	Experimental	4	Python
44	Aerendal/ishkarim-rag Hybrid RAG on CPU-only SQLite: FTS5 + embeddings + RRF fusion. 235 knowledge sources.	19	Experimental	—	Python
45	paswell-chiks/Optimizing-RAG-with-Hybrid-Search 🔍 Optimize RAG systems by exploring Lexical, Semantic, and Hybrid Search...	15	Experimental	—	Jupyter Notebook
46	mollyiverson/ACME10-HE-RAGApp Retrieval-Augmented Generation (RAG) chat-box application using Knowledge...	15	Experimental	—	Python
47	mizamoon/rag-trump-twitter 🧢🇺🇸 Hybrid RAG (BGE-M3 + BM25 + rerank) по постам Трампа из Twitter	14	Experimental	—	Python
48	vanshksingh/Thread-RAG Thread-RAG: Traversal-Heuristic Retrieval for Embedded And Distributed RAG	14	Experimental	—	Python
49	NevroHelios/hierarchical-rag Multi-source Hierarchical RAG with hybrid retrieval (dense + BM25 + RRF),...	14	Experimental	—	Jupyter Notebook
50	patelpattu90-ai/hybrid-rag-knowledge-engine Production-style Hybrid RAG system with semantic + keyword retrieval,...	14	Experimental	1	Python
51	Setoju/similarity_search Similarity search using embeddings, BM25 and reranking (RAG)	14	Experimental	1	Ruby
52	Riccorl/golden-retriever Golden Retriever - A Lightning framework for retriever architecture prototype	13	Experimental	11	Python
53	Arnav-Ajay/rag-hybrid-retrieval A controlled experiment evaluating whether hybrid (dense + sparse) retrieval...	13	Experimental	—	Python
54	btboilerplate/RAG-Systems-Lab A modular RAG experimentation framework benchmarking BM25, vector, hybrid,...	13	Experimental	—	Jupyter Notebook
55	JitamB/Backstory-Consistency-NLP A RAG-based NLP pipeline that verifies character backstories against entire...	13	Experimental	—	Python
56	Ezenitac-AiService/Hybrid_RAG API와 설치형 LLM을 이용한 간단한 RAG 시스템 구현을 위한 개발문서	13	Experimental	—	—
57	RAGE-AI-Enterprise/rage-core R.A.G.E AI Core - RAG-based API platform for enterprise AI tools.	13	Experimental	—	—
58	Arnav-Ajay/rag-reranking-playground Controlled experiment isolating reranking as a first-class RAG system...	13	Experimental	—	Python
59	Samanosukeh/rag-hybrid-search-multi-query RAG project using Qdrant with hybrid search: dense + sparse vectors	13	Experimental	—	Python
60	rwmicro/rag-backend Service de RAG pour la recherche et la génération de réponses basées sur des...	13	Experimental	—	Python
61	USTC-StarTeam/ASEE EMNLP2025 Findings \| Adaptive Schema-aware Event Extraction with...	12	Experimental	3	Python
62	JhaAyush01/Reranking-in-RAG Reranking from scratch using sentence-transformer, BM25, Cohere and...	11	Experimental	—	Jupyter Notebook
63	fllin1/hoopla Modern search engine techniques implemented end-to-end: keyword (BM25),...	10	Experimental	1	Python

Comparisons in this category

LightRAG and RAG-Anything (70 vs 66) LightRAG and R2R (70 vs 51) LightRAG and raglite (70 vs 63) LightRAG and rag-fusion (70 vs 56) LightRAG and GraTAG (70 vs 48) LightRAG and OpenRag (70 vs 40) RAG-Anything and raglite (66 vs 63) rag-fusion and OpenRag (56 vs 40)