Software & utilities

Free plan

Carve

Software & utilities

Carve is a markup language for structured documents with defined syntax for headings, tables, references, math, and optional extensions.

• Free
• API unknown
• Checked Oct 4, 2026

Free tier unknown

Cascade Space

Software & utilities

Cascade Space is building a commercial deep-space communications network using scalable antenna arrays. It offers Array Designer planning tools and Array operations software for missions that need reliable links beyond low Earth orbit.

• Not listed
• API available
• Checked Oct 4, 2026

Free tier unknown

CashBook

Software & utilities

CashBook provides NPCI-certified UPI wallets for business expenses in India. Finance teams issue employee wallets with limits, track spend in real time, collect bills, and sync transactions to Tally or Zoho Books.

• Not listed
• API unknown
• Checked Oct 4, 2026

Free plan

Cassandra

Software & utilities

Apache Cassandra is an open-source distributed NoSQL database built to manage massive datasets with high availability and linear scalability. It targets always-on workloads across commodity hardware with tunable consistency, CQL access, and a large ecosystem of integrations.

• Free
• API available
• Checked Oct 4, 2026

Free trial

Catapush

Software & utilities

Catapush delivers reliable mobile push notifications with delivery tracking, optional end-to-end encryption, and enterprise white-label messaging. Accounts start with a sandbox free tier measured in monthly unique active recipients before enterprise quotes.

• Not listed
• API unknown
• Checked Oct 4, 2026

Free trial

CatchJS.com

Software & utilities

CatchJS monitors client-side JavaScript errors and real-user performance metrics such as Core Web Vitals, capturing stack traces, optional screenshots, click trails, and source maps so teams learn about breakages before users report them.

• $49.00/mo · starting plan
• API unknown
• Checked Oct 4, 2026

Free tier unknown

CatLight

Software & utilities

CatLight is a desktop action center for developers that aggregates CI builds, release pipelines, pull requests, and issue trackers into tray notifications and a prioritized task list. It integrates with systems such as GitHub, GitLab, Jenkins, Azure DevOps, Jira, and TeamCity.

• Not listed
• API available
• Checked Oct 4, 2026

Free tier unknown

Caution

Software & utilities

Caution is a verifiable confidential compute platform that deploys workloads to trusted execution environments with cryptographic proof that production matches reviewed source, kernel, and toolchain layers.

• Not listed
• API unknown
• Checked Oct 4, 2026

Free plan

cdnjs.com

Software & utilities

cdnjs is a free, community-driven public CDN backed by Cloudflare for popular JavaScript, CSS, and font libraries. Maintainers add packages via GitHub pull requests and receive versioned assets with SRI hashes served over HTTPS from Cloudflare’s edge.

• Free
• API available
• Checked Oct 4, 2026

Free trial

Centreon

Software & utilities

Centreon is an observability platform for IT infrastructure monitoring, log management, and digital experience monitoring. It offers alerting, dashboards, SLA views, SaaS or self-hosted deployment, hundreds of connectors, and modules for synthetic and real-user web performance testing.

• Not listed
• API unknown
• Checked Oct 4, 2026

Free trial

CertObserver

Software & utilities

CertObserver monitors TLS certificates across inventories, Certificate Transparency logs, and live endpoints with expiry alerts, team roles, and a free CT search tool. Plans bundle inventory limits, CT monitors, endpoint checks, and Slack or email notifications.

• $9.00/mo · starting plan
• API unknown
• Checked Oct 4, 2026

Free plan

CesiumJS

Software & utilities

It pairs with Cesium ion services for hosted terrain and 3D Tiles but the library itself is free to embed.

• Free
• API unknown
• Checked Oct 4, 2026

Free plan

Cevelop

Software & utilities

Cevelop extends Eclipse CDT into a C++ IDE with CUTE unit testing, refactorings, quick fixes, template visualization, and modern C++ upgrade helpers in a single downloadable package aimed at professional C++ developers.

• Free
• API unknown
• Checked Oct 4, 2026

Free tier unknown

ChaiBar

Software & utilities

The public site loads as a single-page application without server-rendered product copy on the homepage.

• Not listed
• API unknown
• Checked Oct 4, 2026

Free tier unknown

Chartbeat

Software & utilities

Chartbeat provides real-time and historical analytics for digital newsrooms and publishers, including live dashboards, audience engagement metrics, content optimization, and benchmarking tailored to editorial teams tracking traffic and reader behavior.

• Not listed
• API unknown
• Checked Oct 4, 2026

Free trial

Chartbrew

Software & utilities

Chartbrew builds live KPI dashboards from databases and APIs for product teams and agencies. Connect sources, define reusable datasets, compose charts and goals, refresh on schedules, and share or embed dashboards with optional self-hosting.

• $29.00/mo · starting plan
• API available
• Checked Oct 4, 2026

Free plan

ChatDB

Software & utilities

ChatDB offers a browser-based toolkit of more than 50 free utilities to convert, view, and edit data files such as CSV, Parquet, JSON, GeoJSON, SQLite, and images. Tools run locally in the browser for quick inspection without uploading to a server.

• Free
• API unknown
• Checked Oct 4, 2026

Free plan

ChatDOC

Software & utilities

ChatDOC is a document Q&A platform for PDFs, Office files, scans, websites, EPUB, and markdown with TapSource citations, cross-file questions, translation, and formula or image analysis add-ons. It also offers ChatPaper, browser extensions, and API products for developers.

• Free
• API available
• Checked Oct 4, 2026

Free plan

Chatous

Software & utilities

Chatous is a random chat network for meeting new people over text and video with optional expiring photo sharing. It emphasizes anonymity, interest-based matching, and mobile apps rather than generative AI image creation.

• Free
• API unknown
• Checked Oct 4, 2026

Free plan

ChatWithDocs

Software & utilities

Chat With Docs lets professionals upload PDFs and office documents to ask natural-language questions with citations, sharing, and export options. It advertises fast processing, SOC 2 aligned security messaging, and plans from a free daily quota up to unlimited Pro usage.

• $10.99/mo · starting plan
• API unknown
• Checked Oct 4, 2026

Free plan

Check All

Software & utilities

Builds are published for Chrome, Edge, Firefox, and Opera from Chris Pederick’s official download page.

• Free
• API unknown
• Checked Oct 4, 2026

Free plan

Checker Framework

Software & utilities

The Checker Framework augments Java’s type system with pluggable checkers that catch nullness, concurrency, regex, tainting, and other defects at compile time. It ships as open-source compiler plug-ins, documentation, and tutorials for writing custom checkers.

• Free
• API available
• Checked Oct 4, 2026

Free plan

Checkout

Software & utilities

Zoho Checkout lets businesses build branded hosted payment pages for one-time and recurring charges, embed or share them across channels, retry failed payments, and connect payment gateways with analytics and email notifications.

• Free
• API unknown
• Checked Oct 4, 2026

Free plan

Chhoto URL

Software & utilities

Chhoto URL is a lightweight self-hosted URL shortener written in Rust with an Actix backend and SQLite storage. It supports custom aliases, expiring links, hit counts, notes, QR codes, a programmatic API, and tiny OCI container images for low-memory deployments.

• Free
• API available
• Checked Oct 4, 2026

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