Alternatives to PPN Hub — public APIs over MCP

Same category, ordered by trust score.

Z
Zotero MCP
77Good
Search, read, annotate, and add to your Zotero research library, local or web.
Registry54yyyu5.4K stars
H
haiku.rag
74Good
Local-first agentic RAG with citations - hybrid search, reranking, multimodal document retrieval
Registryggozad629 stars
M
M3 Memory
70Good
Local-first, cloud-friendly memory — 100+ tools, 99.2% LongMemEval-S retrieval@8, hybrid search.
Registryskynetcmd29 stars
D
doc-scraper
69Good
Crawl documentation sites into local corpora agents can search, read, and diff fully offline.
Registrysriram-pr107 stars
O
Onyx MCP
66Good
Secure MCP access to Onyx search, chat, projects, and administration.
Registrybywaleed0 stars30/wk3 tools
J
jDocmunch MCP
63Good
Section-level doc search for .md, .rst, .adoc, .ipynb, .html, .yaml, .json, and OpenAPI specs.
Registryjgravelle205 stars