Before I found this overview and your comments here today, I started two other similar overviews. One on Quora and the other on Bestvendor. Here they are:

http://www.quora.com/Startups/What-are-some-notable-startups...

http://www.bestvendor.com/lists/startup-tools-for-startups

Here is a copy of my older post on Quora, please take a look at my newer BestVendor list (see link above) as well:

- SETUP

http://www.getdash.com/ (currently down or pivot)

- Claim your brand name

claim.io

Trademarkia

- Workspace and office space

Loosecubes

LiquidSpace

42Floors

- MANAGEMENT

- Business Analytics

Geckoboard

Chartio

- Cloud Aggregation and Unified Activity Streams

Hojoki

Flowdock

Zapier

Otixo

Cloudbot

Refinder

dispatch.io

busyflow.com

300.mg

cloudsnap.com

manybots.com

tractionstream.com

clutchapp.com

jaconda.im

- Business Intelligence

GoodData

- Contractor Management

oDesk

Elance

- Communication

Yammer

Salesforce Chatter

Socialcast

- Coordination, Collaboration

Zoho

Podio

Asana

Trello

Basecamp

Huddle

Planbox

Teambox

Dropbox

- Resource-Planning

Erply

- Human Resources (HR)

Workday (software)

- Social CRM

NimbleCRM

capsulecrm.com

Batchbook

- Cloud integration

SnapLogic

- Expenses

Expensify

- Invoicing

Tradeshift

FreshBooks

- Time Tracking

getharvest.com

toggl.com

- Customer Support

Assistly

Zendesk

Olark

SnapEngage

- Feedback

UserVoice

Get Satisfaction

Intercom

- Content Management

Acquia (Drupal)

- Wiki

MindTouch

- BACKEND

Cloud Hosting

Heroku

Engine Yard

- Database

Cloudera

- Virtualization Skytap

- Storage

Pure Storage

- Mobile Backend

Urban Airship

Parse

- WebSockets

Pusher

- Cloud Telephony, SMS

Twilio

Tropo

- Payments, Billing

Stripe

Recurly

Zuora

Spreedly

Chargify

- Code repository

GitHub

Beanstalk

- API Management

Mashery

Apigee

- DEVELOPMENT

iOS Testing

TestFlight

- Issue Tracking

Pivotal Tracker

Sifter

lighthouseapp

- Monitoring

New Relic

Airbrake (iOS Bug tracking)

Crittercism (iOS Bug tracking)

- DESIGN

Mockups/Wireframes/Workflows

Balsamiq

InVisionApp

Mockingbird

Axure RP

Mockflow

OmniGraffle

Mockup Builder

HotGloo

- MARKETING

- Email

MailChimp

SendGrid

Mailjet

- Social Media

Buddy Media

Sprout Social

- Beta Invite / Landing Page Management

LaunchRock

Prefinery

KickoffLabs

- Pre-Launch

UsabilityHub

- Video

Vimeo

Ooyala

- Analytics

Chartbeat

Mixpanel

Optimizely

App Annie

Distimo

- Infographics

Visual.ly