General Assessment Tools
ACTFL Proficiency Guidelines 2012
ACTFL Performance Descriptors
Cambridge English
Common European Framework of Reference for Languages
IELTS
iTEP
SMU-MATE
Pearson Language Tests
PISA
TELC Language Tests
TOEFL
TOEIC
Tracktest
Trinity Exams

Text-based Tools
Wordcounter
Word Frequency Indexer
Textanalyser
Word Frequency Downloadable Software
Text Content Analysis Tool
C-Test Creator
Scrambled Word Text Generator 
Optimal Character Recognition Tool
Free Test Readability Consensus Calculator
Readability Index Calculator
Colour Text Readability Experiment
Text Summarizer
Text Translator
Audacity - Sound Editor
Text to Phonetics (IPA) Tool
Cometdocs File Converter

Vocabulary Related Tools
Lexical Free Net
Word Association
Word Association Search
Word Associations Network
Corpora4Learing 
WordNet
Web Concordancer
Lextutor
Lextutor Concordancer
Corpus of American Soap Operas
Corpus of Contemporary American English (COCA)
MiCASE
British National Corpus (BNC)
Free Rice
Word List Generator
Vocabulary Guessing Game
English Robot Tutor