Datomic
MySQL
MarkLogic Server
Valentina Server
Firestore
Datahike
Matisse
Oracle TimesTen
ChainMemory
Mem0
Agentmemory
Memori
Tempreon
cognee
TheSecondBrain.dev
Suprflo
ChainMemory gives your AI agents persistent memory that belongs to YOU โ not to a single vendor.
Save a memory in ChatGPT, recall it in Claude or Gemini. Available via Chrome extension, MCP server (npm), or REST API. Every memory gets a cryptographic fingerprint and project states are anchored with Merkle proofs, so anyone can independently verify integrity โ no trust required.
Memories consolidate into a structured Project Brain (decisions, milestones, risks) instead of a pile of raw notes. Multi-agent native: Claude, Cursor and GPT share one consolidated state. Free tier available.
Datomic
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MySQL - The world's most popular open source database
Mem0 - Your private, local memory layer for all AI tools
MarkLogic Server - MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.
Agentmemory - Persistent memory for Claude Code, Codex & coding agents
Valentina Server - Valentina Server is 3 in 1: Valentina DB Server / SQLite Server / Report Server
Memori - Persistent memory from agent trace, not just conversation