Many companies such as Google freely give pretrained word vectors (trained on a subset of Google News, incorporating the top three million words/phrases) for various vector dimensions: for example, 25d, 50d, 100d, 300d, and so on. You can find the code (and the resulting word vectors) here. In addition to Google News, there are other sources of trained word vectors, which use Wikipedia and various languages. One question you might have is that if companies such as Google freely provide pretrained word vectors, why bother building your own? The answer to the question is, of course, application-dependent; Google's pretrained dictionary has three different vectors for the word java based on capitalization (JAVA, Java, and java mean different things), but perhaps, your application is just about coffee, so only one version of java is all that is really needed.
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