Best Devloper Tools in 2026

Free, 100% client-side IP subnet and CIDR calculator. Calculate IPv4/IPv6 ranges, masks, usable hosts, AWS/Azure/GCP cloud VPC offsets, and export Terraform cidrsubnet configurations instantly.

Key DevSubnet features:

100% Client-Side Cloud VPC Offsets IaC Syntax Export

free

Shared cloud environments for AI coding agents. Run Claude Code, Cursor CLI, Codex, and Gemini CLI from any device, API, or automation tool.

Key CloudCLI features:

Multi-Agent Support Git Integration Persistent Cloud Sessions Web UI & Mobile App

Try for free Open Source paid Free Trial €7 / Monthly

Temp Mail With OTP Auto-Copy – Free, No Sign-Up, No Timer.

Key Toolxz Temp Mail features:

No Timer Restriction Custom Human Usernames QR Code Mobile Sync Real-Time OTP Capture

free

Temp Mail is the provider of fake and temporary email ID.

Key TempMail features:

Privacy Protection Spam Prevention Quick and Easy Anonymous Communication

Temp Mail and Email provides temporary, anonymous, free, secure, disposable email address. You can register facebook, twitter or instagram for anonymously!

IP Calculator. ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets....

Key ipcalc features:

Ease of Use Multifunctional Free Tool Quick Results

Open Source

FreeCustom.Email is a free, ad‑free, and privacy-first temporary email service that empowers users with full control—choose your alias, pick from multiple rotating domains, and enjoy instant inbox setup.

Key Free Custom Email features:

User-friendly, fast UX Clean, privacy‑first interface Developer empowerment

Open Source freemium

Guerrilla Mail is a web-based app that provides a disposable and anonymous email address. Users of the service are not required to set up an account in order to send or receive emails.

Key Guerrilla Mail features:

Anonymity Temporary Email No Registration Required Spam Filter

Open Source

Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.

Key 10 Minute Mail features:

Anonymity Quick Setup Spam Protection Cost

SolarWinds Virtualization Manager is a virtual machine monitoring and troubleshooting.

Key SolarWinds Virtualization Manager features:

Comprehensive Monitoring Performance Optimization Capacity Planning Ease of Use

Any Inbox. Any Time.

Key Mailinator features:

Anonymity and Privacy Convenience Spam Prevention Cost-Effective

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Key Mail-in-a-box features:

Ease of Setup Full Control Cost-effective Open Source

Open Source

Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.

Key calculator.net features:

Comprehensive Range of Calculators User-Friendly Interface Free Access Detailed Explanations

Temporary email addresses don't have to suck.

Key 10 Minute Mailbox features:

Privacy Protection Spam Reduction Convenience No Registration Required