These tools are personally used by me and, are from the perspective of Full-Stack Developer.

Javascript Libs

1. PDF:
   • Hopding/pdf-lib: Create and modify PDF documents in any JavaScript environment (github.com). Not Maintained Now, instead use next one.
   • cantoo-scribe/pdf-lib: Create and modify PDF documents in any JavaScript environment (github.com)
   • docusealco/docuseal: Open source DocuSign alternative. Create, fill, and sign digital documents ✍️ (github.com)
   • wojtekmaj/react-pdf: Display PDFs in your React app as easily as if they were images. (github.com)
   • @react-pdf/renderer – npm (npmjs.com)
   • parallax/jsPDF: Client-side JavaScript PDF generation for everyone. (github.com)
2. Node JS:
   • puppeteer/puppeteer: Node.js API for Chrome (github.com)
3. Frameworks
   • React
   • React Native (Could install expo modules later, instead of full-fledged expo controlled build)
   • Angular
   • Vue 3
   • Haven’t used Svelte
4. Buffer lib: feross/buffer: The buffer module from node.js, for the browser. (github.com)
5. PunnyCode: mathiasbynens/punycode.js: A robust Punycode converter that fully complies to RFC 3492 and RFC 5891. (github.com)
6. Pako (JS Zlib): pako – npm (npmjs.com)
7. Selection: selection – npm (npmjs.com)
8. Ascii85: ascii85 – npm (npmjs.com)
9. jsencrypt – npm (npmjs.com)
10. PGP: https://docs.openpgpjs.org/#create-and-verify-detached-signatures, https://www.linuxjournal.com/content/pretty-good-privacy-pgp-and-digital-signatures
11. digitalbazaar/forge: A native implementation of TLS in Javascript and tools to write crypto-based and network-heavy webapps (github.com)
12. rootca-id/pkiwebsdk: PKI WebSDK is a JavaScript library to simplify programming PKI-aware applications in pure JavaScript. The library is designed to create web based PKI application fully on the client side. (github.com)

CMS

1. WordPress

Know how

1. https://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/Acrobat_DigitalSignatures_in_PDF.pdf

I will add more as I use them 🤖