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The eraser, the marker/pen, the Marquee Tool, and the Type Tool.
The Single Row Marquee Tool.
The Marquee tool is just a way of creating a selection in a certain shape. The rectangular marquee tool creates a selection in the shape of a rectangle (as you might imagine), whereas the elliptical marquee tool creates a selection in the shape of an ellipsis (oval) or circle.
In photoshop the oval tool is called the ellipse tool. The keyboard shortcut for all the shape tools is U (press the U key). It will highlight the currently selected shape tool in the tool bar on the left of the photoshop window. If the ellipse tool is not allready showing just click the little triangle in the lower right of the shape tool to bring up all the shape tool options, find the ellipse tool and click it. There is also an ellipse (oval) selection tool called the elliptical marquee tool. The keybaord shortcut is M for the marquee tools. To find it use the same method as above.
Photoshop Lightroom does not have such a tool. Anyway you can use external editing software like Photoshop or Photoshop Elements. See related links for more details.
Feathering
For selections you can your the Marquee Tool, Lasso Tool, or Magic Wand Tool. To cut that selection you can use the Move Tool, or the Ctr-X keyboard shortcut.
Selections tools inside Adobe Photoshop are : Lasso tools, Marquee tools, Magic Wand and Quick Selection, Color Range from Select menu and you can also trace edges with Pen Tool or Magnetic Pen Tool which is accessible when Freeform Pen Tool is active.
Using selection tools from Toolbox: Magic Wand, Quick Selection tool, Rectangular and Elliptical Marquee tools...
Use any selection tool from Toolbox on left side of screen (Window>Toolbox). Selections tools are Magic Wand (W), Quick Selection tool (W) Rectangular Marquee tool (M), Elliptical Marquee tool (M) or use powerful Color Range command from Select menu.
Marquee tool does use to make selections, and it makes rectangular selections. Choose marquee tool from the toolbar, (Or press M) and pull to draw rectangle and it will appear selection with marching ants surrounded. With this selection you can cut this portion, or make new layer from selection or even fill it with color or add stroke around selection etc. See related link for more details.
type tool, rectangle, line, crop, pick (select object), marquee tool, many, many color swatches, drop shadow tool, bevel and emboss, 3d and so on...