The WordPress Block editor introduced in WordPress 5.0 was originally developed as a feature plugin called Gutenberg.
Blocks are the fundamental element of the editor. They are the primary way in which plugins and themes can register their own functionality and extend the capabilities of the editor.
Summary
Blocks for oik plugins

oik-blocks
For oik-plugins all blocks were initially developed in the oik-blocks plugin. Since the start of 2020 many of these blocks have been implemented in their relevant plugins.
oik plugins delivering blocks
Several oik plugins now deliver blocks.
oik
- Address – oik/address
Displays your address from oik-options - Contact form – oik/contact-form
Displays a Contact form - Countdown – oik/countdown
Countdown timer - Dynamic content block – oik/content-block
Expands content for dynamic oik shortcodes. - Follow me – oik/follow-me
Displays Social media links - Google Maps – oik/googlemap
Displays a Google Maps map using oik options - Shortcode block for oik-shortcodes – oik/shortcode-block
Expands oik shortcodes
oik-bob-bing-wide
- CSV – oik-bbw/csv
Displays CSV content - Dashicon – oik-bbw/dashicon
Displays icons - GitHub Issue – oik-bbw/github
Display a link to a GitHub issue - Search – oik-bbw/search
Displays a search form - WordPress – oik-bbw/wp
Displays information about WordPress and PHP versions
Total amount of Block related content you’ll find in this site:
WordPress blocks
WordPress provides 35 core blocks for creating content in your own site and over 30 blocks for Embedding content from other sites.
Others
Many other plugins and themes have started delivering their own blocks.
Yoast SEO, Jetpack, WooCommerce