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validates_email_format_of Validate e-mail addreses against RFC 2822 and RFC 3696 with this Ruby on Rails plugin and gem.

crystal ruby a gem that allows you to write Crystal code, inlined in Ruby. All you need is a modern crystal compiler installed on your system.

PythonMonkey A Mozilla SpiderMonkey JavaScript engine embedded into the Python VM, using the Python engine to provide the JS host environment.

madge is a developer tool for generating a visual graph of your module dependencies, finding circular dependencies, and giving you other useful info.

excelize Go language library for reading and writing Microsoft Excel™ (XLAM / XLSM / XLSX / XLTM / XLTX) spreadsheets

vernier Next-generation Ruby 3.2.1+ sampling profiler. Tracks multiple threads, GVL activity, GC pauses, idle time, and more.

doltgresql Imagine a Postgres with git style log, diff, branch, and merge functionality. This is just that. The company behind it originaly released a MySQL flavored, but now they are taming Postgres.

automq a cloud-native, serverless reinvented Kafka that is easily scalable, manage-less and cost-effective. It uses Object storage(s3, gcs) as the main storage. Using EBS for durable cache layer to accelerate write. It’s 100% compatible with Apache Kafka greater than 0.9.x and not lose any good features of it, but cheaper and better.

drawdb robust and user-friendly database entity relationship (DBER) editor right in your browser. Build diagrams with a few clicks, export sql scripts, customize your editor, and more without creating an account.

glimmer a DSL framework to build GUI app in Ruby. It contains a DSL engine to express he GUI, and a data binding lib to sync GUI with model attributes bidirectionally.

tetragon owerful real-time, eBPF-based Security Observability and Runtime Enforcement such as monitoring file changes, block operation to file etc.

maxtext a high performance, arbitrarily scalable, open-source, simple, easily forkable, well-tested, batteries included LLM written in pure Python/Jax and targeting Google Cloud TPUs. MaxText typically achieves 55% to 60% model-flop utilization and scales from single host to very large clusters while staying simple and “optimization-free” thanks to the power of Jax and the XLA compiler.

atrament A small JS library for beautiful drawing and handwriting on the HTML Canvas. An use case is you can use to take user signature and have it smoothen out. Check the demo as well.

ruby-advisory-db A database of vulnerable Ruby Gems. useful to not miss a vulnerable if you are using Ruby