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Students get to adjust the second segment of a piecewise linear function on an interval $[a,b]$ to make it continuous or not.
Graphs a function $f (x)=g(x)h'(x)$ and the area under the graph of $f (x)$ for a given interval, and shows the modifications made to $f (x)$ and the area when considering $u=g(x)$ and $v Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface. This GeoGebra applet and accompanying activities illustrate the formal definition of a sequence of real numbers converging to a limit \(L$ through a series of interactive exercises.

The applet shows graphically and numerically consecutive terms of a sequence or consecutive partial sums of a series.

This applet allows the user to look at the Taylor polynomial approximation to a function $f(x)$.

This resource is a geogebra applet with minimal instructions that allows the user to explore the limit of a sequence visually.
WinPlot is a freely distrributed simple 2D and 3D grapher, with built-in features for creating animations, tables of values, and more.
WolframAlpha is an online computational knowledge engine. It can accept natural language input and is programmed with thousands of computational algorithms.
In the M-N definition of an infinite limit at infinity, students get to select M and then adjust N to satisfy the definition.