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General utilities

Small, general-purpose tools.

They cover time zones and dates, text encoding and conversion, file format conversion, calculators and bundles of utilities.

Listings are what publishers declare in their ARD catalogs and the registries StealthStack reads. The category and summaries are our reading of each listing. Each listing links to its own page with the publisher's endpoint.

All types MCP serversSkillsA2A agentsAPIs
Time and dateText and encodingFile conversionCalculatorsUtility bundles
  1. MCP SERVERmicrosoft/markitdown Converts PDF, Word, Excel, images and audio to Markdown.
  2. SKILLArchive Container Reader & Converter Skill to list and extract zip, tar, gz and 7z archives to JSON or text.
  3. A2A AGENTDuo Data Utilities 33 deterministic data utilities (IDs, time, text, geodesy); $0.05/call via x402.
  4. SKILLApple Plist Reader & Converter Skill to read Apple plist files and convert them to text, JSON or CSV.
  5. SKILLConvert files with Convert To It Skill for converting files between formats in the browser without uploading.
  6. MCP SERVERJohn's Essentials 153 deterministic file tools for PDF, image and media conversion; OAuth connect.
  7. MCP SERVERchangethisfile File conversion across 1,000+ routes plus document translation and compression jobs.
  8. APIConvert To It format API Free API listing file formats and converters supported by Convert To It; no key.
  9. API2s.io Sunrise Computes sunrise, sunset and twilight times; pay per call via x402 USDC.
  10. MCP SERVERArchive Container Reader & Converter (runner) Server-side runner that lists and extracts zip and tar archives.
  11. API2s.io Barcode Generates QR, Aztec, Data Matrix and PDF417 codes; x402 USDC per call.
  12. API2s.io Chinese Chinese script conversion, detection and pinyin; pay per call via x402 USDC.
  13. API2s.io Iso ISO currency, language and subdivision code lookups; x402 USDC per call.
  14. API2s.io Calendar Holiday-aware business days, holidays, earnings and IPO calendars; x402 per call.
  15. SKILLiCalendar Reader & Converter Skill to parse .ics calendar files and convert events to text, JSON or CSV.
  16. MCP SERVERApple Plist Reader & Converter (runner) Server-side runner that reads and converts Apple plist files.
  17. MCP SERVERConvert To It MCP server Keyless MCP checking format conversions and linking the in-browser converter.
  18. API2s.io Hash Computes cryptographic digests; pay per call via x402 USDC.
  19. SKILLvCard (.vcf) Reader & Converter Skill to read vCard .vcf contact files and export to text, JSON or CSV.
  20. API2s.io Phone Parses and validates phone numbers with libphonenumber; x402 USDC per call.
  21. MCP SERVERvCard (.vcf) Reader & Converter (runner) Server-side runner that converts vCard .vcf files to CSV, JSON or text.
  22. A2A AGENTArgonautWorks Schedule Fit Finds DST-aware meeting windows across 2-8 time zones' business hours.
  23. MCP SERVERiCalendar Reader & Converter (runner) Server-side runner that merges and converts iCalendar .ics files.
  24. API2s.io Timezone Resolves a coordinate to its IANA timezone; pay per call via x402 USDC.
  25. API2s.io Convert Currency and unit conversion endpoints; pay per call via x402 USDC.
  26. API2s.io Countdown Generates an animated countdown GIF to a date; x402 USDC per call.
  27. SKILLmarkitdown Skill to convert documents and URIs to Markdown with Microsoft MarkItDown.
  28. API2s.io Time Parses timestamps and dates into canonical forms; x402 USDC per call.
  29. SKILLdBase DBF Reader & Converter Skill to read dBase/FoxPro DBF tables and convert them to text, CSV or JSON.
  30. SKILLEML Email Reader & Converter Skill to read .eml email files and convert them to text, JSON or CSV.
  31. SKILLMSG Outlook Email Reader & Converter Skill to read Outlook .msg files and convert them to text, JSON or CSV.
  32. SKILLWindows Registry Export Reader & Converter Skill to read Windows .reg export files and convert keys and values to JSON or CSV.
  33. SKILLconvert-word-to-md Skill that converts Word documents to Markdown for analysis.
  34. SKILLconvert-excel-to-md Skill that converts Excel workbooks to Markdown for analysis.
  35. SKILLRTF Reader & Converter Skill to convert RTF documents to plain text, JSON or Markdown.
  36. MCP SERVERdBase DBF Reader & Converter (runner) Server-side runner that converts dBase DBF files to CSV, JSON or text.
  37. SKILLmbox Reader & Converter Skill to read .mbox mailbox archives and export to JSON, CSV or text.
  38. SKILLEPUB Reader & Converter Skill to read EPUB e-books and convert them to text, JSON or CSV.
  39. A2A AGENTbroke2built Data & Intelligence Skills Agent data skills: email/DNS intel, page audits, extraction, EVM reads; free tier, x402.
  40. MCP SERVEREML Email Reader & Converter (runner) Server-side runner that reads .eml files and extracts attachments.
  41. MCP SERVERFluentEDI MCP server Deterministic tools for agents incl. time, crypto and EDI X12; no key or signup.
  42. MCP SERVERWindows Registry Export Reader & Converter (runner) Server-side runner that reads and converts Windows .reg exports.
  43. MCP SERVERMSG Outlook Email Reader & Converter (runner) Server-side runner that converts Outlook .msg files to text, JSON or CSV.
  44. APIvCard QR Code Generator OpenAPI spec OpenAPI spec for vCard QR payload generation, templates and async jobs.
  45. MCP SERVERRTF Reader & Converter (runner) Server-side runner that converts RTF files to text, JSON or Markdown.
  46. MCP SERVEREPUB Reader & Converter (runner) Server-side runner that summarizes and converts EPUB files.
  47. MCP SERVERmbox Reader & Converter (runner) Server-side runner that splits and converts mbox mailboxes.
  48. SKILLconvert-plaintext-to-md Skill that converts a text document to Markdown per prompt options.

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