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This is supposed to be a highlevel overview and list of functionality that is easily available from the standard SAGE interface. The idea is to basically *NOT* say "can do what GAP does". Instead describe actually functionalitty. Imagine a reader who has never heard of Maxima, GAP, Singular, Givaro, etc. 
This is a highlevel overview and list of functionality that is easily available from the standard SAGE interface. (The intended reader has never heard of Maxima, GAP, Singular, Givaro, etc.) 
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* Extensive support for arithmetic with a range of different models of padic arithmetic. 
What SAGE Can Do
This is a highlevel overview and list of functionality that is easily available from the standard SAGE interface. (The intended reader has never heard of Maxima, GAP, Singular, Givaro, etc.)
Calculus
 SAGE has fairly complete symbolic manipulation capabilities, including symbolic and numerical integration, differentiation, limits, etc.
Coding theory
 A wide range of basic functionality.
Commutative Algebra
 Fast computation of Groebner basis.
Cryptography
 Classical ciphers are well supported.
Elementary Education
 The SAGE notebook (a graphical interface) is a useful tool for basic math education because of its flexible visualization/output capabilities.
Finite Fields
 Very fast arithmetic over finite fields and extensions of finite fields (especially up to cardinality 2^16).
Graphical Interface
 A webbrowser based graphical interface, which anybody can easily use or share. The GUI can also be used for any math software that SAGE interfaces with.
 A wiki with math typesetting preconfigured.
Group Theory
 Permutations groups
 Abelian groups
 Matrix groups (in particular, classical groups over finite fields)
Interfaces
 Interpreter interfaces to Axiom, CoCoA, GAP, KASH, Macaulay2, Magma, Maple, Mathematica, Matlab, Maxima, MuPAD, Octave, and Singular.
 C/C++library interfaces to NTL, PARI, Linbox, and mwrank.
Linear Algebra
 Compute the reduced row echelon form of e.g. dense 20,000x20,000 matrices over GF(2) in seconds and 50MB of RAM.
 Computation of reduced row echelon forms of sparse matrices.
 Fast matrix multiplication, characteristic polynomial and echelon forms of dense matrices over QQ.
Number Theory
 Compute MordellWeil groups of (many) elliptic curves using both invariants and algebraic 2descents.
 A wide range of number theoretic functions, e.g., euler_phi, primes enumeration, sigma, tau_qexp, etc.
 Compute the number of points on an elliptic curve modulo p for all primes p less than a million in seconds.
 Optimized implementation of the SchoofElkiesAtkin point counting algorithm for counting points modulo p when p is large.
 An optimized modern quadratic Sieve for factoring integers n = p*q.
 Modular symbols for general weight, character, Gamma1, and GammaH.
Modular forms for general weight >= 2, character, Gamma1, and GammaH.
Numerical Computation
 Fast arithmetic and special functions with double precision real and complex numbers.
 Matrix and vector arithmetic, QR decomposition, system solving.
padic Numbers
 Extensive support for arithmetic with a range of different models of padic arithmetic.
Plotting
 SAGE provides 2d plotting functionality similar to Mathematica's.
 SAGE provides limited 3d plotting via an included ray tracer.
Polytopes
 State of the art support for computing with lattice polytopes.
 Exact convex hulls in any dimension can be quickly computed (requires the optional polymake package).