Tools for building ambitious startups

A community-curated, open-source list of over 1,400 free APIs organized across 50+ categories. One of the most popular projects on GitHub, used by developers to discover and integrate free APIs.

A content curation tool for marketers to build email newsletters, roundup blog posts, resource hubs, and branded social shares from content found online. Supports drag-and-drop editing and rich media.

Alternative toCCurated|RRevue|Mailchimp

A real-time customer feedback platform that deploys AI-powered Nudge micro-surveys on websites and apps. Captures contextual insights with sentiment analysis to help teams understand user behavior.

Alternative toHotjar|QQualtrics|UUsabilla

An AI-powered advertising platform that optimizes campaigns for business outcomes across channels. Its Audience Graph identifies high-converting audiences across CTV, audio, video, display, mobile, and native.

A keyword research tool that uncovers low-competition, long-tail keywords and questions people ask around a topic. Pulls data from SERPs, People Also Ask, Reddit, and Quora with metrics like difficulty and volume.

Alternative toAnswerThePublic|Ahrefs|Semrush

An email verification service that validates addresses in real time to prevent fake and unreachable emails. Offers bulk list cleaning, SMTP-level checks, and auto-correction via API or dashboard.

Alternative toZZeroBounce|NNeverBounce|Hunter

An AI social media agent that learns your brand voice, generates content, and auto-posts to social networks around the clock. Originally known for hand-picked, curated content suggestions for sharing.

Alternative toBuffer|Hootsuite|MMissinglettr

A comprehensive SEO platform offering rank tracking across search engines, keyword research, SERP analysis, website audits, backlink monitoring, and AI content writing to improve search visibility.

Alternative toAhrefs|Semrush|MMoz

A curated, searchable library of thousands of real marketing emails that email designers and marketers use for inspiration, plus tools to save and share collections. Now part of Beefree.

Alternative toBBeefree|Mailchimp|MMilled

An Envato design tool offering unlimited downloads across tens of thousands of customizable templates for product mockups, logos, social graphics, and videos, all in the browser with no design skills needed.

Alternative toCanva|AEAdobe Express|MMockey.ai

A subscription management and recurring billing platform that automates plans, checkout, payment recovery, revenue recognition, and subscriber retention for digital subscription businesses.

A project management and team collaboration platform that combines task tracking, multiple project views, HD video meetings, and reporting in one workspace.

Alternative toAsana|TTrello|MMonday.com

Referral and affiliate marketing software that lets ecommerce brands launch reward programs, turning customers and partners into sales channels with automated tracking and fraud protection.

A first-party affiliate tracking and management platform for ecommerce brands that automates affiliate recruitment, commission tracking, and payouts without relying on cookies or redirects.

Alternative toReferralCandy|IImpact|PartnerStack

An AI tool that automatically removes the background from any image, producing transparent PNGs for product shots, headshots, logos, and graphics, available online and via API.

An all-in-one creative platform for making videos, logos, mockups, graphics, and websites from customizable templates, with AI generation tools and built-in hosting.

Alternative toCanva|AEAdobe Express|Animoto

An AI-driven sales engagement platform that automates multichannel outreach across email, LinkedIn, SMS, and calls, with a built-in B2B contact database and AI SDR for lead generation and follow-ups.

Alternative toOutreach|Salesloft|AApollo.io

An omnichannel customer support suite combining help desk ticketing, a feedback community, knowledge base, and live chat, available as both cloud-hosted and self-hosted with open-source code.

Alternative toZendesk|Freshdesk|Help Scout

A survey tool with a drag-and-drop builder for creating cross-platform surveys and forms, with real-time analytics, skip logic, and online or offline collection via web and mobile apps.

Alternative toSurveyMonkey|Typeform|Jotform

A Google developer feature that uses schema.org structured data markup in emails to surface actions and key information directly inside Gmail, such as one-click confirmations, view buttons, and order or reservation highlights.

Element (formerly Riot.im) is a Matrix-based end-to-end encrypted messenger and collaboration app offering chat, voice, and video, deployable as self-hosted for data sovereignty or via a managed hosting service.

Alternative toMMattermost|Rocket.Chat|ZZulip

Roadmunk (now Strategic Roadmaps by Tempo) is roadmapping software with drag-and-drop timeline, swimlane, and portfolio views plus customizable templates for building and sharing presentation-ready strategic roadmaps.

Alternative toProductboard|AAirfocus|JPJira Product Discovery

An open-source team communication platform centralizing real-time messaging, voice, video, AI, and apps for secure internal and external collaboration, with strong self-hosting and data-sovereignty options for regulated industries.

An AI-powered creative automation platform that turns briefs and master designs into versioned ad creatives, banners, and videos at scale, enforcing brand and retailer compliance across dozens of formats.

Alternative toCCeltra|Canva|SSmartly