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LanguageTool is an Open Source proofreading software for English, French, German, Polish, Romanian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect like mixing up there/their and it detects some grammar problems.

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/* LanguageTool, a natural language style checker
 * Copyright (C) 2015 Daniel Naber (http://www.danielnaber.de)
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */
package org.languagetool.rules;

import org.languagetool.JLanguageTool;

import java.io.InputStream;
import java.util.*;

/**
 * Load replacement data from a UTF-8 file. One replacement per line,
 * word and its replacement(s) separated by an equals sign. Both the
 * word and the replacements can have more than one form if separated
 * by pipe symbols.
 * @since 3.0
 */
public final class SimpleReplaceDataLoader {

  /**
   * Load replacement rules from a utf-8 file in the classpath.
   */
  public Map> loadWords(String path) {
    InputStream stream = JLanguageTool.getDataBroker().getFromRulesDirAsStream(path);
    Map> map = new HashMap<>();
    try (Scanner scanner = new Scanner(stream, "utf-8")) {
      while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        if (line.isEmpty() || line.charAt(0) == '#') { // # = comment
          continue;
        }
        String[] parts = line.split("=");
        if (parts.length != 2) {
          throw new RuntimeException("Could not load simple replacement data from: " + path + ". " +
                  "Error in line '" + line + "', expected format 'word=replacement'");
        }
        if (parts[1].trim().isEmpty()) {
          throw new RuntimeException("Could not load simple replacement data from: " + path + ". " +
            "Error in line '" + line + "', replacement cannot be empty");
        }
        String[] wrongForms = parts[0].split("\\|");
        List replacements = Arrays.asList(parts[1].split("\\|"));
        for (String wrongForm : wrongForms) {
          map.put(wrongForm, replacements);
        }
      }
    }
    return Collections.unmodifiableMap(map);
  }

}