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Eesti Õigekeelsussõnaraamat ÕS 2006
Eesti keele seletav sõnaraamat
Eesti keele sõnastikud, erialasõnastikud, tõlkesõnastikud, võõrkeelsed sõnastikud ja palju muud
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Improving Writing Style
Purdue OWL conciseness
Purdue OWL eliminating words
Purdue OWL changing phrases
Purdue OWL things to avoid
Improving Writing Style
British American Spelling
Overview of tenses per section
Online Dictionary/Thesaurus - If you don't feel like carrying a huge book with you. Accessible online. It's a dictionary and thesaurus.
Academic Phrase Bank - The Academic Phrasebank is a general resource for academic writers. It aims to provide you with examples of some of the phraseological "nuts and bolts" of writing organised under the headings to the left. It was designed primarily with international students whose first language is not English in mind. However, if you are a native speaker writer, you may still find parts of the material helpful.
Academic Word list - The Academic Word List was developed by Averil Coxhead as her MA thesis at the School of Linguistics and Applied Language Studies at Victoria University of Wellington, New Zealand. The list contains 570 word families.
An abundance of resources which helps to sort out those pesky punctuation marks
More on punctuation
Punctuation - the Comma
The Comma usage 1
Comma Seven Steps
Even more on punctuation
An Online English Grammar
An abundance of information on grammar, though the site sometimes suffers from too much linguistic jargon. But if you have a question about grammar, you will find the answer here.
The Internet Grammar of English
University College London site with loads of information and exercises on grammar.
Guide to Grammar and Writing
Full of quizzes on a wide variety of language acquisition issues. The quizzes are arranged according to issues addressed (vocabulary, word order, verb use, idioms and more) and level of difficulty. Very user friendly site, you can easily and efficiently find specific exercises to work on your trouble spots.
English Exercises EFL Exercises & Quizzes
Pretty straightforward site: not many frills, but with loads and loads of exercises: grammar, collocations, phrasal verbs, you name it. Don't be put off by the title 'Business English'!
Grammatical Tenses Overview