Super User is about computer software, hardware, and personal networking per the FAQ:
Super User is for computer enthusiasts and power users. If you have a question about …
- computer hardware
- computer software
- personal and home computer networking
The point that Super User is not about Web Applications is well-discussed.
Are questions that ask for software, that start with "I need software that does..." appropriate?
If so, would answers that suggest Web-based options okay?
For example, this question on file sharing/collaboration is relatively platform-agnostic, though many of the answers reference websites.