The following is a list of helpful online tools.
SQL Fiddle
If you do not know SQL or basic database concepts, this site is not going to be very useful to you. However, if you are a database developer, there are a few different use-cases of SQL Fiddle intended for you:
You want help with a tricky query, and you’d like to post a question to a Q/A site like StackOverflow. Build a representative database (schema and data) and post a link to it in your question. Unique URLs for each database (and each query) will be generated as you use the site; just copy and paste the URL that you want to share, and it will be available for anyone who wants to take a look. They will then be able to use your DDL and your SQL as a starting point for answering your question. When they have something they’d like to share with you, they can then send you a link back to their query.
You want to compare and contrast SQL statements in different database back-ends. SQL Fiddle easily lets you switch which database provider (MySQL, PostgreSQL, MS SQL Server, Oracle, and SQLite) your queries run against. This will allow you to quickly evaluate query porting efforts, or language options available in each environment.
You do not have a particular database platform readily available, but you would like to see what a given query would look like in that environment. Using SQL Fiddle, you don’t need to bother spinning up a whole installation for your evaluation; just create your database and queries here!
.Net Fiddle
Online .Net compiler (C#, VB.Net, F#)
Diff Now
DiffNow lets you compare text files, documents, binary files, and archives up to 2048KB in size.
XPath Generator
The Xpath generator will help you automatically generate xpaths. Paste in your xml and place the cursor in the element you need the xpath to and it will generate an xpath. The xpath will be shown in the xpath results text area.
Online regex tester and debugger: JavaScript, Python, PHP, and PCRE
Free PCRE-based regular expression debugger with real time explanation, error detection and highlighting.
Binary Hex Decimal Ascii Converters
Easily convert bin, hex, decimal, and ascii numbers to each other. All you need is to open the conversion pair page and type the number in the relevant box.
Tables Generator
Generate tables, with data, in various formats; such as Markdown Tables for use with docuwiki.
P/Invoke.Net
PInvoke.net is primarily a wiki, allowing developers to find, edit and add PInvoke* signatures, user-defined types, and any other information related to calling Win32 and other unmanaged APIs from managed code (written in languages such as C# or VB.NET).
.Net Reference Source Code
Browse the .NET Framework source code online, with search and navigation powered by Roslyn.
Collection Of Input Output Tools
The Online Tools site has a large list of online tools, including the following:
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