Tag
Sessions
5 reviewed tools: 4 free or open source, 1 hosted with a real free tier.
Order: free and open source first, then hosted products with a real free tier, then paid-led; catalog order inside each group, with quiet or archived repos last. Not a score, and no tool pays for its place.
5 tools
- LettaEpisodic memory for agents that think across sessions
Free / OSS · Apache-2.0 · 25.2k GitHub stars
VerdictThe memory architecture for agents that need to think long-term.
CatchMore complex to reason about than simple vector retrieval. The paging mechanism adds latency and orchestration overhead. Documentation assumes understanding of the original MemGPT paper.
- agentsviewMIT local-first agent session/cost archive — 20+ coding agents
Free / OSS · OSS/MIT · 6.2k GitHub stars
VerdictMIT local agent archive. Session/cost on disk; not Langfuse/Braintrust cloud.
CatchVs Langfuse / Braintrust (cloud LLM observability): agentsview is a local session/cost archive for coding-agent transcripts, not a hosted tracing/eval platform. Optional anonymous telemetry ping; you still need the agent logs on disk. Not a replacement for production OpenTelemetry of your app’s LLM calls.
- AX CheckHosted free agent-experience checklist + recorded coding-agent sessions
Free / OSS · OSS/MIT
VerdictFree hosted AX smoke test. Grades how agents use your product, not how good your model is.
CatchGrades are provisional and technical-only — treat the report as a useful first pass, not a product-wide quality certificate. Vs Promptfoo / DeepEval: AX Check grades product AX (docs, CLI, MCP, SDK), not model quality, eval scores, or safety behavior. Hosted free is convenient; verify the session evidence and rerun after interface changes.
- Context ModeElastic-2.0 MCP sandbox for tool output and session continuity
Free / OSS · Elastic-2.0 · 31.4k GitHub stars
VerdictElastic-2.0 source-available context middleware. Useful SQLite/FTS MCP sandbox; no hosted/managed offering without a careful license review.
CatchElastic License 2.0 is source-available, not OSI open-source; do not treat the `open-source` label as MIT/Apache freedom. ELv2 restricts offering the software as a hosted or managed service, so review the license before embedding or commercializing a managed Context Mode deployment. Vs a plain MCP server: this is output/context infrastructure, not another domain tool.
- SuperTokensApache-2.0 session auth you can self-host with no MAU cap
Free tier · Freemium · 15.3k GitHub stars
VerdictApache-2.0 auth with no self-host MAU cap. Architecture is three pieces.
CatchThree processes, not a single library. ee/ is not Apache. Cloud is MAU-metered; MFA and account-linking have 100 USD/month minima on Cloud. Read the carve-out before you assume the whole repo is Apache-2.0.
FAQ
- What is the top free pick among Sessions?
- Letta leads the Stack Gems list for Sessions. Verdict: The memory architecture for agents that need to think long-term.
- How many Sessions does Stack Gems review?
- 5: 4 free or open source, 1 hosted with a real free tier. Each review has a verdict and an honest Catch; no tool pays for its spot.
- Which Sessions can I self-host for free?
- Letta and agentsview.
- Which Sessions have the most GitHub stars?
- Context Mode (31.4k), Letta (25.2k), SuperTokens (15.3k), per GitHub on 2026-10-21. Stars measure attention, not fit; read the Catch.
- What is the catch with Letta?
- More complex to reason about than simple vector retrieval.