什麼是演講者模式？
演講者模式（Speaker mode）是一種計算機操作模式，通常用於演示或演講。在這種模式下，屏幕顯示的內容隻能由演講者控制，而觀眾無法操作屏幕或輸入任何內容。這樣可以確保演講過程的流暢性，並避免在演講過程中出現意外的幹擾。
演講者模式通常由演講者的電腦或演示軟件提供。它可能包括一些特殊的功能，如定時提醒演講者換講、黑屏、顯示當前時間、防止屏幕截圖等。使用演講者模式時，演講者通常會使用一個遙控器或者鍵盤快捷鍵來控制屏幕顯示的內容。
演講者模式在會議、演講、培訓等場合中非常有用。它可以幫助演講者將註意力集中在內容本身上，而不用擔心觀眾對屏幕進行操作或輸入內容打擾演講過程。
Power Point 的演講者模式大傢已經很熟悉。但是最近在beamer 的演講過程中，沒有找到可以顯示備註的軟件進行適配。以下就推薦幾款開源軟件，大部分是python編寫的。
軟件目錄
pympress
Pympress is a PDF presentation tool designed for dual-screen setups such as presentations and public talks. Highly configurable, fully-featured, and portable
It comes with many great features (more below):
- supports embedded gifs (out of the box), videos, and audios (with VLC or Gstreamer integration)
- text annotations displayed in the presenter window
- natively supports beamer's notes on second screen, as well as Libreoffice notes pages!
Pympress is a free software, distributed under the terms of the GPL license (version 2 or, at your option, any later version).
Beamer Presentation
這個應該是我覺得最好用的一款瞭，沒有延遲，並且也可以支持備註、光標等。
Présentation.app is a presentation tool for pdf slides (e.g. produced using LaTeX and the popular beamer class, but it does not depend on LaTeX) for Mac OS X.Its most notable features are:
- support for distant presentation/teaching: inset of live video from the presenter; white board and support for pen interaction; support for more than 2 screens setups; "spotlight", "laser" and large cursor mode on presentation screen.
- a presenter view displaying: the current and next slide; a timer; and the notes associated to the current slide.
- a presentation view displaying: the current slide; and optionally: live annotations; inset video of the presenter; spotlight to highlight part of the slide.
- hyperlinks do work: internal links (e.g. navigation links generated by beamer) work; links to local video files open the video on the presentation screen; embeded movies are played on the presentation screen; links to other files are opened in a webview on the presentation screen.
- usable: from the command line (as it is a Python script); from the Finder (as it accepts dropping a PDF file to launch the app).
pdfpc
pdfpc is a GTK-based presentation viewer which uses Keynote-like multi-monitor output to provide meta information to the speaker during the presentation. It is able to show a normal presentation window on one screen while showing a more sophisticated overview on the other one, providing information like a picture of the next slide, as well as the time left in the presentation. pdfpc processes PDF documents, which can be created using nearly all modern presentation software.
Impressive
Impressive is a program that displays presentation slides. But unlike http://OpenOffice.org Impress or other similar applications, it does so with style. Smooth alpha-blended slide transitions are provided for the sake of eye candy, but in addition to this, Impressive offers some unique tools that are really useful for presentations. Read below if you want to know more about these features.
Creating presentations for Impressive is very simple: You just need to export a PDF file from your presentation software. This means that you can create slides in the application of your choice and use Impressive for displaying them. If your application does not support PDF output, you can alternatively use a set of pre-rendered image files – or you use Impressive to make a slideshow with your favorite photos.
SlidePilot
這個軟件不能顯示備註，所以並不怎麼推薦。但是還是相比前幾個好安裝一些。
Splitshow
A tool for the dual-head presentation of PDF slides on Mac OS X, most likely using a laptop and a projector. The project arose out of the need to correctly project slides created with LaTeX's beamer class.
This project has been imported from the original, discotinued Google Code project(http://splitshow.googlecode.com). The aim is to create an up-to-date version of the SplitShow program with the same features and to extend it later on.
