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Few things are more irritating than having to deal with a format that is incompatible with what you need it to do. It doesn’t matter if it’s a media file, document, or shoe size; it’s just plain frustrating. To make your life easier, check out this list of 101 tools that will allow you to convert just about anything.(from: cogniview.com)

There are lots of specialized tools out there, but sometimes you just need one good tool to get the job done. These mega tools are great for general conversions.

Mega Tools

1. Zamzar: Zamzar does all sorts of conversions, ranging from documents and images to music and video. In addition to its versatility, this tool boasts the ability to do all of your conversions without downloading software.
2. CZ Document Converter: CZ Document Converter is a powerful batch document converter. It supports every popular document file you may need, including PDF, HTML, DOC, XLS, and WPS.  
3. Image Converter Plus: Image Converter Plus can professionally convert graphic files, photos, drafts, finance documents, and any image format. It supports more than 120 graphics formats and more than 800 dialects of these formats. You can convert files in a batch while also altering and enhancing images.
4. DVD Ripper Platinum: Directly rip DVD for playback on iPhone, Zune, iPod, Apple TV, PSP, Smart Phone, etc. Support video trimming, video cropping, video effect adjustment and video file merging, and merge several chapters into one file or just rip DVD by chapters or titles

Media

If you use an MP3 player, download movies, or even just rip CDs, there’s a good chance you’ve had to deal with the frustration of having a format that’s incompatible with your device or software. These tools will make it all better.

7. Audio

8. Video Converter Platinum: Wondershare Video Converter Platinum is the best video format converter that can convert your video files including FLV video to various formats to meet different format requirements and for playback on most popular players including iPod, iPhone, Apple TV, Zune, PSP, Pocket PC, Creative Zen,  and Archos and so on.
9. Audacity: Audacity is a great tool that can be used to convert tapes and records into digital recordings or CDs. Check out their site to see what else this audio powerhouse can do.  
10. OSS Audio Converter: This tool is an audio format converter with a high level of customization. Using the OSS Audio Converter, you can select the coding method for VBR compression, fine-tune settings, and choose a range of frequencies to filter.
11. Ripper Pack Platinum: Ripper Pack Platinum is a pack program bundled by the three most popular and powerful Wondershare applications: DVD Ripper Platinum, Video Converter Platinum and Video to DVD Burner. It has the complete functions to rip DVD, convert video and burn video files to DVD discs.
12. DVD to Wii Converter: DVD to Wii converter lets you trim DVD movie length, crop video, select DVD subtitle and audio track, and apply video effects to DVD video and so on. It is a great tool to make better use of your Nintendo Wii player. 
13. Intelliscore Polyphonic WAV to MIDI Converter: With IntelliScore, you can convert MP3, WAV, and WMA files to MIDI. It has lots of additional features, like vocal track removal and sheet music.
14. Free MP3 WMA Converter: With this tool, you can take any Windows Media file and turn it into an MP3 that can be used with a variety of different players.
15. Video to Zune Converter: Video to Zune Converter is a perfect solution for Zune users who want to put their regular video files on Zune players. It can convert most regular video formats including AVI, WMV, MOV, RM, RMVB, DAT, FLV, ASF, MPG and MPEG and so on.
16. FreeRIP: This freeware application allows users to convert files between MP3, FLAC, WAV and more.
17. dBpoweramp Music Converter: The dBpoweramp can be used to rip CDs and convert audio files to pretty much any format you might need. This can all be done without altering tags.
18. DVD Burner: Fast video-editing and DVD-authoring application. In just five steps, you can easily convert and burn all popular video files (AVI, MP4, MPG, MPEG, 3GP, WMV, ASF, RM, RMVB, DAT, MOV ) to DVD for backup and enhancement.
19. Direct Audio Converter and CD Ripper: Music lovers can use this tool to convert music files to popular formats while keeping folder structures and tags intact