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How to find web hosting that meets my requirements?

I often times build web applications purely because I enjoy it. I like building useful tools or open source applications that don't come with a price tag. That being said, many of these applications can be quite complex requiring services beyond shared hosting (ex. specific PHP extensions). This leaves me with two options:

• Make the web application less complex and run on shared hosting.
• Fork out money for cloud or dedicated/VPS hosting.

Considering the application is free (I don't make money off of it intentionally), the money for hosting comes out of my own pocket. I know I am not alone in this sticky situation.

So the question is, what are the hosting options that provide more advanced features such as shell access via SSH, ability to install specific software/extensions (ex. if I wish to use a NoSQL DB such as Redis, MongoDB, or Cassandra), etc., at a free or low price point?

I know free usually equates to bad/unreliable hosting -- but it's not always the case. There are a couple providers with free plans I know of:

• Amazon EC2 - Free micro-instance for 1 year
• AppHarbor - Cloud based .NET web application hosting w/ free plan.

What else is available for hosting of non-profit applications?