§???????? Open source doesn't require you to give your software away for free: If you sell your software, you're simply required to make sure your customers have access to, and can modify, the source code.
開源不要求你必須免費(fèi)提供軟件：如果你要賣軟件，你只要允許客戶能夠訪問(wèn)并修改源代碼就可以了。

§??????Services for your own product: Companies sell training, support, documentation, certification that their product will run with a particular piece of hardware or software, and commercial (to sell) add-ons to the main product.
為你的產(chǎn)品提供服務(wù)：提供培訓(xùn)服務(wù)，文檔支持或者對(duì)于那些在特定軟硬件條件下運(yùn)行的軟件的認(rèn)證，或者是在主產(chǎn)品上的商業(yè)的附加軟件。

§????????Services for other people's products: In the open source world, anyone can offer support for an open source product. Third-party support is one of the key issues that draws individuals and companies to open source.
為別人的產(chǎn)品提供服務(wù)：在開源世界里，任何人都可以為開源產(chǎn)品提供服務(wù)，第三方的支持是將個(gè)人和公司引入開源世界的一個(gè)重要議題。

§???????? Extending and integrating other people's products: Another facet of third-party service, in the open source model, is that anyone can build add-ons for a piece of software.
擴(kuò)展和集成別人的產(chǎn)品：第三方服務(wù)的另一個(gè)方面，在開源模式中，任何一個(gè)人都可以為軟件創(chuàng)建附加軟件。

§???????? Providing documentation for other people's products: Writers sell articles, white papers, ebooks, computer books, and other items to help people figure out what's going on.
為別人的產(chǎn)品提供文檔：Writer們可以買文章，白皮書，電子教程，書籍或者其他什么主題的文字來(lái)幫助人們解決問(wèn)題。

§???????? Selling less restrictive licenses: In many cases, if a company wants to use a chunk of free software or open source code in its product without releasing its code to their customers or to the public, it's possible to purchase a less restrictive license from the developer.
買限制較少的license：在大多數(shù)情況下，如果一個(gè)該公司想要使用大量的開源代碼而不發(fā)布代碼個(gè)顧客或公眾的時(shí)候，可能要從開發(fā)者那里購(gòu)買有少量限制的license.

§???????? Gaining contracts based on open work: Many open source programmers find that they're approached by companies that want to write something similar to the programmer's open source product, and are impressed by what this programmer has done.
獲得開源工作上的合同：許多開源程序員發(fā)現(xiàn)，想要開發(fā)和他寫的代碼差不多產(chǎn)品的公司經(jīng)常會(huì)聯(lián)系他們，這些公司對(duì)他們的印象很深刻。

above from:http://library.theserverside.com

update ＠ my opinion
實(shí)際上忠實(shí)于開源運(yùn)動(dòng)的大多是我們這些程序員，那么是不是或許可以說(shuō)，開源實(shí)際上對(duì)我們來(lái)說(shuō)可以看成我們自己創(chuàng)造的福氣。一方面，在開源活動(dòng)中我們的技術(shù)能力和手段最終轉(zhuǎn)變成聲譽(yù)，將給我們這些一心樸實(shí)做程序的人帶來(lái)更好的職業(yè)機(jī)會(huì)和選擇；另一方面，憑借多年修煉的技術(shù)背景和對(duì)當(dāng)前開源軟件的運(yùn)用，輔以適當(dāng)?shù)氖袌?chǎng)眼光，也會(huì)給我們的人生帶來(lái)更多的機(jī)會(huì)。
這樣說(shuō)實(shí)際上多少基于這樣一種現(xiàn)實(shí)，那就是在現(xiàn)在的條件下，程序員被看成是給老板加班賣命，干得最多吃的最少的苦角色，網(wǎng)絡(luò)上經(jīng)常可以見到拿我們同民工同妓女的比較，現(xiàn)實(shí)中你是否也感到身體開始臃腫，體力開始下降，腰背疼痛開始滋生呢，更有一些過(guò)勞死之類的陰影時(shí)時(shí)籠罩著我們，驗(yàn)證著程序員只能吃青春飯的斷言。
開源這件事情不見得能夠讓我們擺脫這種“悲慘世界”里的命運(yùn)，但是卻可能給我們帶來(lái)更好的生存條件。朋友們，不管你是真正追求技術(shù)，還是迫于生存壓力，都應(yīng)該認(rèn)清形勢(shì)，磨練經(jīng)驗(yàn)，在工作和生活的環(huán)境中不斷向前看，跟進(jìn)技術(shù)快速發(fā)展的脈搏，這才是王道啊。