XFS (Something First Search)

• #FS
• BFS
• DFS
• EFS
• GFS
• HFS
• LFS
• MFS
• NFS
• QFS
• SFS
• WFS
• YFS

#FS

• 360 First Search

BFS

• Baidu First Search
• Bing First Search

DFS

• DuckDuckGo First Search

EFS

• Ecosia First Search
• Exalead First Search

GFS

• Google First Search
• Gigablast First Search

HFS

• HotBot First Search

LFS

• Lycos First Search

MFS

• MetaCrawler First Search
• Mojeek First Search

NFS

• NAVER First Search

QFS

• Qwant First Search

SFS

• Startpage.com First Search
• Sougou First Search
• Soso First Search
• Swisscows First Search

WFS

• WebCrawler

YFS

• Yahoo! First Search
• Yandex First Search
• Yippy First Search