Mathematics software for Linux?

[Matthew Inman <mminman mindspring com>]

	Anyone know of a good, free (or inexpensive) math app for Linux which
can do analytic and numeric differentiation and integration.  If it can
do more that'd be even better.
	I've been a Mathematica user for years but have recently sworn off it
due to Wolfram Research's increasingly restrictive (and expensive) use
policies.  What I like best about Mathematica is its
completeness/versatility.  What I hate about it is its user interface.
	I don't expect to get something for free/cheap which is as complete as
Mathematica.  I'm working on putting together a "suite" of apps which
together rival Mathematica.
-- 
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|  Matthew Inman             1 -|  .-.                     |
+  Graduate Student             | /   \       .-.     _    +
|  UNC-Chapel Hill           0 -|/     \     /   \   / \   |
+  Physics & Astronomy          |       \   /     `-'   `- +
|  inman physics unc edu    -1 -|        `-'               |
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