A JavaScript/TypeScript implementation of the SuperMemo 2 (SM2) algorithm for spaced based repetition flashcards.

ISO 8601 interval, date, and duration parser

Create 2d primitive shapes, encapsulate and repeat them by handling each repetition and generate recursive shapes

Takes whatever amazing craziness a given pattern calls for and materializes it.

Limit the number of times a message is allowed to pass through the node before it is discarded

The world's easiest, most powerful random function.

Check password strength against several rules. Includes ActiveRecord/ActiveModel support.

Deterministic query-parameter parsing and serialization.

This library analyzes the words and phrases in a text and presents the most repetitive words and phrases with the number of repetitions. The difference from other libraries is that it focuses on words and phrases, not words.

A Joplin plugin to create repeating to-dos (version 2)

Portable Tasksets, graders, evaluation runs, receipts, conformance fixtures, and Work evidence for OpenPond Harnesses

A powerful and comprehensive plugin for to-do repetition/recurrence

Bench/eval prompt variants using Anthropic: tokens, thinking tokens, cost, latency, and stability across repeated, concurrent runs

Identify LLMs by behavioral fingerprint — send simple questions, match answer distributions against 176+ models using Jensen-Shannon Divergence (AUC 0.97)

Geco, a (Constant Amortized Time) recursive generator* for k-combinations, chosen from a given set S of n elements, with and without replacement.

A quick general purpose compression / minification algorithm for JSON structures

Angular security helpers for preventing ReDoS and other security vulnerabilities

Opinionated pure js MurmurHash3 with legacy implementation TypeScript. NiceHash in js.

Auto-detect usage patterns and generate Claude Code skills, commands, and agents

Composable timelines for React.