A cute, high-performance text search engine (cf Elasticsearch), written in Rust, with a RESTful API!
https://github.com/meilisearch/MeiliSearch
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One advantage I've come to appreciate about Dash/Zeal docsets: it's really nice having focused search.
The text search is constrained to the languages I care about enough to download the docset, substantially increasing the relevance. In Google I'd need to specify the language.
One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).

https://spec.commonmark.org/0.31.2/#images
It's so strange that we talk about languages being slow, and have done for years. Computer performance has increased so much in this time.
https://hbfs.wordpress.com/2009/11/10/is-python-slow/ (shared on HN in 2009) discusses Python being slow. My underpowered Thinkpad has 20x the single-threaded performance! https://www.cpubenchmark.net/compare/73vs3766/AMD-Athlon-64-4000+-vs-AMD-Ryzen-5-PRO-4650U
Maybe *relative* performance of languages matters more?