Google services

This page is a quick reference listing some alternatives to various Google products. Another directory of alternatives exists at Google-Sucks.org, and Libre Projects is a directory of free & open source alternatives, focusing on web apps & usability. You can also search for others at dooblet, alternativeTo, or via your favorite search engine. This is by no means comprehensive! There are A LOT of alternatives out there for some services (like advertising, email, and search engines).

"As much as possible"

Adsense

AdBrite
Bidvertiser
Clicksor
Chitika
This list kept short for now due to an overwhelming number of options.

Alerts

Analytics

AWStats (open source)
Clicky
crazyegg
Mint
Piwik (open source)
Site Meter
Woopra
From early 2010, additional discussion and recommendations.

Android

Android without linked Google account (reduces Google's ability to track usage)
BlackBerry
iPhone
Windows smartphones

Android Market

Amazon Appstore
Aproov
GetJar
OnlyAndroid
SlideME
YAAM
F-Droid (Open source app repository for Android)
Soc.io Mall
Aptoide
Android Freeware Lovers
Android Freeware
AndroidFreeSoftware

App Engine

Blogger

Blog Search

Calendar

Checkout

Chrome

Avant
Chromium (open source basis for Chrome)
Firefox
Internet Explorer
Iron (built on Chromium; Google tracking removed)
K-Meleon
Konqueror
Lunascape
Maxthon
Opera
Safari
Sleipnir

Chrome OS

TAILS (The Amnesiac Incognito Live System)
Puppy Linux
Pendrivelinux

Docs - suite

Docs - spreadsheet

Docs - presentations

Docs - word processing

EtherPad Foundation

Zoho Writer
Teamlab - project management, document management and collaboration platform with powerful online docs editor, alternative to google docs.
Libre Docs, is a remoteStorage-compatible web application, you decide where your data is stored. More info on unhosted.org