Supabase
Create a backend in less than 2 minutes. Start your project with a Postgres database, authentication, instant APIs, real-time subscriptions and storage. Build faster and focus on your products. Every project is a full Postgres database, the world's most trusted relational database. Add user sign-ups and logins, securing your data with Row Level Security. Store, organize and serve large files. Any media, including videos and images. Write custom code and cron jobs without deploying or scaling servers. There are many example apps and starter projects to get going. We introspect your database to provide APIs instantly. Stop building repetitive CRUD endpoints and focus on your product. Type definitions built directly from your database schema. Use Supabase in the browser without a build process. Develop locally and push to production when you're ready. Manage Supabase projects from your local machine.
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Catalyst by Zoho
Catalyst by Zoho is an agent-ready, full-stack cloud unifying BaaS and PaaS for building, deploying, and scaling apps, microservices, integrations, front-ends, dashboards, and AI features, also completely free for students. It offers Compute, Storage (Stratus Object Storage, Relational Data Store, File Store, Cache), Hosting (Slate, AppSail), Intelligence (QuickML/AutoML, OCR, Object Detection, Face Analytics, Image Moderation, Barcode Scanning, Text Analytics), Automation (SmartBrowz, Pipelines CI/CD), and Platform services (API Gateway, Auth, Mail, Push, Search, APM, Logging, Mobile Analytics, Domain Mapping, Security, Testing). Agent-ready governance includes scoped logins, disabled destructive commands in non-interactive mode, full audit trails (app, platform, MCP logs), decoupled environments, and collaborator access controls. Pricing: $0 free tier with auto-renewing monthly credits forever, $250 credits for the first 6 months on signup subscription, and pay-as-you-go beyond free.
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SMTP Senpai
SMTP Senpai is MailSenpai's EU-hosted SMTP relay and REST email API for password resets, order confirmations, notifications and website forms. Connect via SMTP on port 2525 or 587 with STARTTLS, the REST API, or a form endpoint for static sites. DKIM signing uses your verified sender domain, with SPF/DKIM/DMARC checks and automatic suppression of bounced addresses. The permanent free plan includes 5,000 emails per calendar month, up to 200 per day and 30 in the preceding hour, one verified sender domain and 7-day sending logs. No card or expiry. Paid annual plans start at EUR 12.90 per month plus VAT for 10,000 emails per month and 90-day logs. An email report is sent weekly on Monday. Official WordPress and Drupal plugins and open-source SDKs support integration. Written support is available in English and Italian. MailSenpai is the separate newsletter and email marketing platform.
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SiteSafe
SiteSafe replaces paper sign‑in sheets with a tablet‑friendly digital check‑in. Each location gets a unique QR code; visitors scan it, enter their details, and must acknowledge your safety or conduct policy before they can proceed—no skipping allowed. A live dashboard shows who is on site right now, updated every few seconds. Hosts receive automatic email alerts when a guest arrives. You can pre‑register expected visitors for one‑tap sign‑in, print visitor badges, and export audit‑ready reports as CSV, Excel, or PDF. Manage unlimited sites from a single account, each with its own settings, QR code, and check‑in page. Built‑in analytics display 30‑day trend charts and total visitor counts. A full REST API allows custom integrations with Slack, HR tools, or dashboards. Flat $49/month, unlimited sites and visitors. 14‑day free trial, no credit card required. No sales calls, ever.
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