There are 4 repositories under meta-search-engine topic.
DDL/Streaming meta search engine
元搜索引擎 searchengine 元数据 元搜索
Decentralized search engine & Automatized press reviews
The Search Engine That's Fast!
A privacy respecting free as in freedom meta search engine for Google and popular torrent sites
These are some of the side projects I have been working which majority is regarding the home server and simple side gigs regarding the networking, raspberry pi and cloud servers
Meta Search Engine using Google and Yahoo