Utilities MCP servers

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes).

U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.

Find the organization behind a MAC address or OUI prefix in the IEEE registries. No auth, no key.

Vehicle routing, 3-D packing, cutting stock, rostering and knapsack with OR-Tools. 7 of 11 free.

Validate emails, phones, IBAN, VAT; look up IPs and companies; rates, holidays, time via Abstract.

Turn HTML or a live URL into polished PDF and Excel files — hosted downloads, async jobs, history.

Validate and explain cron expressions; list next/previous run times in any time zone, DST-aware.

Generate barcodes and QR codes in 35 symbologies: QR, Data Matrix, PDF417, EAN-13, Code 128, more.

Parse a User-Agent: browser, OS, device, plus bot, search crawler, AI crawler and AI agent flags.

Hebrew translation that keeps prices, names and dates exact, RTL display, nikud, clinical Hebrew.

WCAG color contrast checks, nearest accessible color, CSS color conversion and palette pair checks.

Remove duplicate lines or CSV/TSV rows from text. Stateless: processed per call, never stored.

Should I allow this text? Profanity and toxicity checks that are hard to fool, with the evidence.

63 tools: JSON repair, CSV, hashes, cron, dates, units, validators. 25 free calls.

15 tools: weather, time zones, sun and moon, earthquakes, countries. 25 free calls.

Thermal label MCP server: render, validate, debug and convert ZPL, EPL, TSPL and CPCL labels.

Signed time, Bitcoin-anchored notarisation and drand randomness for agents. No account.

69 free finance, military, school and everyday calculators as MCP tools.

UK solar PV and heat pump calculators, with guides, on one server. Follows the MCS methods. No key.

UK solar PV and heat pump calculators that follow the published MCS methods. Open, no key.

More than a hundred everyday tools: PDFs, images, text, data, calculators, dice and currency.

NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load.

Exact utilities for agents: time zones, date math, business days, calculator, units, validation.

Search and run data, text, code, PDF and web APIs. Requests not stored. Network tools need a key.

File conversion: PDF, DOCX, STT, asynchronous TTS with MP3/ASS downloads, watermarking

Free, no sign-in: favicons, web to Markdown, CSV to chart, text to speech, time zones, passwords.

Check which file formats convert to which, and get links that open the converter.

237 agent tools: chain data, prices, sanctions, web, PDF. 25 free calls, then from $0.002.