Google's Server Names

Here's a list of the Google Servers used by different services as they're returned in the HTTP headers. Not all of them have transparent names and some of them may suggest interesting data (like the ctcserver for the not-yet-existent Google Call service linked from Google's robots.txt). Google Web Server is a modified version of Apache custom server that runs on Linux.

Server Name
Services
GWS (Google Web Server)
Web Search, Image Search and many other services
GFE/1.3 (Google Front-End)
Gmail, Calendar, Picasa Web Albums, Docs, Blogger, orkut, Reader and many other services
GWS-GRFE/0.50
Groups
bsfe (Blog Search Front-End)
Blog Search
OFE/0.1 (Ocean Front-End)
Book Search, Patent Search, Catalogs (Ocean is Google Book Search's code-name)
SMS search frontend 1.0
Google SMS
Search-History HTTP Server
Web History
Auto-Completion Server
Google Suggest, Firefox/Google Toolbar auto-complete
TrustRank Frontend
Safe Browsing
GCS/1.0
Safe Browsing
SFE/0.8
Finance
FTS (C)1997-2007 Interactive Data Managed Solutions AG
Finance charts
asfe
Base
mediaserver
Base (images)
cffe
Product Search (Froogle)
btfe
Thumbnails: Image Search, Google Video, Youtube
Video Stats Server
Google Video
cachefe:image (Cache Front-End)
Picasa Web photos
staticfe
interface images (Picasa Web)
ctcserver
Google Call ( www.google.com/call )
GoogleChartServer/1.0
used for dynamically-generated charts (e.g.: Google Video's stats)
NFE/1.0 (News Front-End)
News
mfe (Maps Front-End)
Maps
Keyhole Server 2.4
Maps, Earth (imagery)
PSFE/4.0
Alerts
igfe (iGoogle Front-End)
iGoogle
COMINST/1.0
Testing software installation (Pack, Picasa)
TWS/0.9 (Translation Web Server)
Translate
mws (Music Web Server)
Music Search
R2FE/1.0 (Reviews Front-End)
Reviews (Music, Movies)
zfe
Reviews
pfe
Co-op
codesite/5477219
Code
ga-reporting-fe
Analytics reporting
ucfe
Analytics
lpfe
Analytics (www.google-analytics.com/siteopt.js)
Toolbar Gaia User Service Server
Google Toolbar authentication
cafe (Ad Conversion Front-End)
Conversions
AdClickServer
Google test ad server
Google Trends
Google Trends
TFE/0.0 (Transliteration Front-End)
Google Indic Transliteration
Apache
most Labs services

{ Thanks, Tony. }