Search Services
searchcode.com
Comprehensive text-based code search, free for Open Source
bonsai.io
Free 1 GB memory and 1 GB storage
searchly.com
Free 2 indices and 20 MB storage
CommandBar
Unified Search Bar as-a-service, web-based UI widget/plugin that allows your users to search contents, navigations, features, etc. within your product, which helps discoverability. Free for up to 1,000 Monthly Active Users, unlimited commands
CodeKeep
Google Keep for Code Snippets. Organize, Discover, and share code snippets, featuring a powerful code screenshot tool with preset templates and a linking feature
Meilisearch
Open-source, fast, and relevant search engine.  
Typesense Cloud
Open-source and hosted search as a Service. 
Algolia
Search as a service and full suite of search APIs
Swiftype
Search as a service (crawlers and React ready)
Namae
Search various websites like GitHub, Gitlab, Heroku, Netlify, and many more for the availability of your project name
Orama Cloud
Free 3 indexes, 100K docs/index, unlimited full-text/vector/hybrid searches, 60 days analytics
Websolr
Open-source and hosted search with Solr