Unfragile

The request is generic ('Utilities'), so the candidates are a mix of developer utility libraries and toolkits. uToolsLib offers free browser-based developer utilities such as a JSON formatter, Base64 encoder and password generator 1, while lxml 10 and Dask 6 are programmer-oriented libraries for processing data and parallel computing, which may not be what is meant. Which kind of utility is needed is unclear.

A question back: What kind of utility do you need: an online tool for formatting or encoding data, a Python library for XML/HTML or data processing, or something for documentation or testing?

1
uToolsLibutoolslib.comverified and signed
Free browser-based developer utilities, including a JSON formatter, Base64 encoder, HTML formatter and password generator, that run locally without signup 1.
Website Docs
for agents: get_dead_code · search_symbol · get_call_chain
2
lxmllxml.dewebsite read, tools not yet checked
A Python library for processing XML and HTML, combining libxml2 and libxslt speed with a native Python API 10.
Website Docs
3
Daskdask.orgverified and signed
A flexible open-source Python library for parallel computing that scales pandas and NumPy style code across machines 6.
Website Docs Get started
+2 community tools built for it
for agents: numpy · pandas · pydata

Sources

1uToolsLib - Privacy-First Developer Tools | Free Online Utilitiesutoolslib.com · read 2026-10-29
6Dask | Scale the Python tools you lovedask.org · read 2026-10-29
10lxml - Processing XML and HTML with Pythonlxml.de · read 2026-10-29

For agents: the 10 actions behind this answer

get_dead_code · larkx verified and signed
Find files and functions that nothing else calls or imports
· async-std website read, tools not yet checked
A Rust library for easy and understandable async programming
utility · pydash verified and signed
automation · Testcontainers verified and signed
· Omnilib website read, tools not yet checked
numpy · dask verified and signed
· Silicaui website read, tools not yet checked
The CSS-first Tailwind component library Base UI behavior, OKLCH design tokens, and one color variant size shape vocabulary across React, framework-neutral HTML, and vanilla JS.
· libslack website read, tools not yet checked
libslack - A UNIX/C library of general utilities for programmers with Slack
· Mantine website read, tools not yet checked
A fully featured React components library with 120+ customizable components, hooks, and utilities. Build accessible web applications faster.
· lxml website read, tools not yet checked
lxml - the most feature-rich and easy-to-use library for processing XML and HTML in the Python language

Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.