2,445 tools
Free to startCoding & development
SignatureAPI offers a legally binding electronic signature HTTP API and dashboard for sending signature envelopes at scale. Pricing emphasizes per-envelope fees after included bundles, integrations, AI toolkit features, and enterprise sales for higher compliance needs.
Free trialCoding & development
SigNoz is an OpenTelemetry-native observability platform for logs, traces, metrics, exceptions, and AI agent telemetry. SigNoz Cloud offers usage-based billing while self-hosted SigNoz can run on your own infrastructure.
Free planSecurity & privacy
SikkerKey is a secrets management platform offering encrypted vaults, machine identities, audit trails, and team organization features for developers and operators. The official site covers CLI and SDK clients, AI agent integrations via an MCP server, and monthly plans that bundle included machines with per-machine overage fees for larger fleets.
Free tier unknownCoding & development
Silogy offers Viv, an on-premise AI verification engineer for digital chip design. Viv debugs failing tests using RTL, logs, waveforms, and a knowledge base to cut repetitive debug work for verification teams.
Free tier unknownResearch & search
Similarix adds semantic search and deduplication on top of Amazon S3 buckets, supporting text and image similarity queries through a dashboard or API. It advertises read-only access, multilingual search, and enterprise-scale indexing options.
Free planCoding & development
Simperium is Automattic’s cross-platform data sync service for apps that need real-time mirroring, authentication, versioning, and serverless backends. The official site explains client libraries, a live dashboard, and tiered monthly plans based on API request volume from trial through enterprise contact sales.
Free planCoding & development
SimpleITK is a simplified interface to the Insight Toolkit (ITK) for medical and scientific image analysis. It exposes image filtering, registration, and segmentation workflows to Python, C#, Java, R, and other languages with examples, Jupyter notebooks, and versioned API docs.
Free planCoding & development
Simple Observability offers server monitoring, website uptime checks, metrics dashboards, log search, alert rules, and cron job monitoring with a one-command install story. The pricing page contrasts a free testing tier with predictable per-server paid pricing and optional volume discounts for larger fleets.
Free planProductivity (email, docs, PDFs)
The homepage also offers a free online PDF editor, while pricing sells Basic through Premium monthly plans for higher volume embeds, API access, and enterprise controls.
Free tier unknownCoding & development
Simulithic runs swarms of simulated users against production web and mobile journeys continuously. When a flow breaks, the service reproduces the failure with environment details before real customers report it.
Coding & development
Singularity coordinates parallel AI development agents with an editor, terminal, Git and task tools.
Coding & development
SkillGild hosts skills and workflows for supported AI coding agents.
Free planCoding & development
Skills Manager is a free, open-source desktop app for managing Agent Skills across 32 AI coding tools including Claude Code, Codex, and Cursor. It installs, syncs, translates, and security-scans skills locally on macOS, Windows, and Linux.
Free planCoding & development
Skillsync captures Claude Code, Codex, and Cursor sessions on your machine, turns useful work into reusable skills, and shares them with teammates across agents. It is local-first with optional shared workspaces for teams.
Free planResearch & search
sktime is the unified open-source AI framework for time series forecasting, classification, and anomaly detection. The community project ships production-ready algorithms with optional enterprise implementation and support services.
Free planCoding & development
Skylight is a performance profiler for Ruby and Rails applications that turns telemetry into actionable insights about slow endpoints and background jobs. The homepage promotes a free month trial, 100,000 free traces each month, and tiered paid plans based on monthly trace volume with automatic tier adjustments.
Free planCoding & development
Skypack is a CDN for loading optimized npm packages directly in the browser without install steps or bundlers, serving billions of requests from a global network. The about page states its mission to make the web faster and more accessible while keeping open-source packages free to import from cdn.skypack.dev.
Coding & development
Sloppy provides local static analysis and fix workflows for PHP code written by AI agents.
Free planCoding & development
Smartcar is a connected-car API platform for retrieving vehicle signals, sending commands, and building integrations across energy, fleet, insurance, and mobility apps. Developers use SDKs and documentation to connect compatible vehicles and scale production integrations.
Free tier unknownCoding & development
Smart Grow Logs is a centralized log management product from the Smart Grow suite. Marketing copy highlights encryption in transit, real-time alerts, and SDKs for web, Flutter, Android, and iOS so teams can collect and monitor application logs from multiple clients.
Free planSecurity & privacy
Smart Grow Vault stores team environment variables and credential files in an encrypted vault with versioning, rollback, and CLI delivery. Organizations group apps and environments, control member access, and sync secrets into local projects or CI pipelines.
Free trialCoding & development
Smarty (formerly SmartyStreets) provides USPS and international address verification, autocomplete, geocoding, and enrichment APIs. Teams use it to validate and standardize location data in forms, CRMs, and logistics workflows with high-throughput cloud lookups.
Coding & development
Smoke Monkey Harness supplies a TypeScript runtime for coding agents, tool loops and MCP servers.
Free to startCoding & development
smol machines provides fast, hardware-isolated Linux microVMs that run locally via smolvm, in smol cloud, or self-hosted with the same SDK and .smolmachine artifact. Pricing combines hourly base machine fees plus consumption for CPU, memory, disk, and egress, with account credits for new users and tiered monthly platform fees on Pro and Startup plans.
Showing 2,184 of 2,445 tools
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