Speed reading is all about how you move your eyes. Using your periferal vision, there are patterns you can train your eyes to follow that will help you read faster while not sacrificing comprehension. The great thing about this method is you don't need any software or any extra "parts".
(I'm going to be using diagrams throughout this post: the red "highlights" over the text represent the position of of your eyes when you read each word. Let me know in the comments if this makes sense.)
Word by word:
Beginner readers focus their eyes on each individual word. This technique works, but it's a lot slower than it could be. People who use this method often read aloud, or use their finger to track their position in the text (they can do this because they are reading word-by-word).
Better readers don't skip words, they read multiple words at the same time using their peripheral vision:
Here's another demonstration of this technique (from IrisReading.com):
This text was originally a large paragraph, but the tutorial split it up into three columns. Using their peripheral vision, most people will be able to read the group of words in each column (in each line) using one glance. When the text isn't broken up into columns, readers can still use this technique by focusing on clumps of words instead of individual words.
Using peripheral vision allows readers to read more words while spending less time moving their eyes between each word. Thus, this technique dramatically increases reading speeds.
Advanced (impossible): reading entire lines at once:
This is theoretically possible, but I've never seen someone use it. The idea is that if your peripheral vision is wide enough, you could be able to read an entire line in one glance. Most people will not be able to do this.
Putting these techniques into practice.
Half the battle is just being aware of how your eyes move when you read. When you read an article (on paper would be best, for learning purposes), try to pay attention to how your eyes focus.
The next step is to train your eyes to use the more efficient motions. You can do this just by making a conscious effort to read in specific ways (which words for me), or you could use a pencil beforehand to indicate focal points for your eyes when practising (e.g. if you are using the "in clumps" method, draw a visual cue every three words to attract your eyes to that spot).