The companies are listed below, along with a brief description of what the founders are up to. Definitely stay tuned, as it will be interesting to see how many of the companies are the same on Demo Day, as they are today. It’s not uncommon for a complete pivot to happen during the course of startup school. Just ask Console.fm.

Twilio, SlideShare, ColourLovers and Plancast are just a few of the dozens of companies that have passed through the 500 Startups accelerator, or have received funding.

Here’s a list of the latest batch, with company descriptions in their own words:

300 Milligrams: 300 Miligrams is a priority inbox for team conversations.

72 Lux: 72 Lux offers consumers a universal checkout and personalized shopping experience while also offering a white-label version for publishers.

BrandBoards: BrandBoards is bringing Google Adwords simplicity and reach to live event digital advertising.

BrightNest: BrightNest  is the Mint.com for home maintenance. We help homeowners manage their most valuable asset with customized tips and reminders.

Cadee: Cadee helps golfers understand and improve their game.

 Central.ly: Central.ly wants to connect all of the social media profiles for small business owners.

Chorus: Chorus is customer feedback without the hassle. Automatically extract meaning from thousands of customer messages as they arrive in real time.

Conta Azul: Conta Azul is a web based SaaS accounting system for Brazilian SMB’s.

Contactually: Contactually is a personal assistant for your professional email contacts that connects directly with your CRM.

Dress Rush: DressRush is a ”Gilt for Weddings” Dress Rush is making Bridezilla’s everywhere clamor to get couture without the cost. Up to 100% off retail ain’t bad, right?

 eSpark: eSpark Learning is “Pandora for education” and creates custom playlists of super fun education apps on iPads for elementary school students.

Farmeron: Farmeron helps farmers across the world to manage their production data online and to do automatized farm performance analysis using exciting statistics.

Fileboard: Fileboard is a service accessed from the iPad that helps manage files and attachments across email, Dropbox, Evernote, and other cloud repositories.

Fitocracy: Fitocracy turns fitness into an addictive gaming experience where you level up in real life.

Forrst: Forrst is where developers and designers improve their craft and companies come to hire them.

Gizmo: Gizmo is a cloud-based multichannel marketing platform for mobile, tablet, social, and web.

GoVoluntr: GoVoluntr is a social platform that brings together volunteers, nonprofits, and businesses to solve today’s social problems.

Hapyrus: Hapyrusoffers the easiest way of leveraging Hadoop to make your system highly scalable.

HighScore House: High Score House turns a child’s routine into a game, making the lives of families easier and more positive than ever before.

Intercom: Intercom lets web businesses build powerful, personal relationships with their users, turning them into loyal customers.

LookAcross: LookAcross helps you to have more conversation by improving your odds of connecting with people.

LoveWithFood: LoveWithFood is the easiest way to find culinary deals & samples, curated by a community of foodies for foodies. For every deal, we donate a meal.

Meloncard: MelonCard removed your personal information from companies selling it.

MeMeTales: MemeTales is a mobile game like reading platform for kids. Fun like Angry Birds without the guilt. Meme Tales is a DEMO ’11 startup.

MoPix: Mopix is going to define what the movie experience can be on tablet devices and make distribution accessible to anyone with film or video content.

OneSchool: OneSchool is a free mobile app that connects students to the people, places, and things around them. OneSchool was an Alpha Pitch startup at DEMO ’11.

PayByGroup: With PayByGroup, ever front money for group purchases again. We coordinate your friends’ payments to the merchant so you can plan activities hasslefree.

Redeemr:  Redeemr helps businesses and celebrities get un-ignored by their social media fans.

Rotadosconcuros: Rotadosconcursos is the best test prep to get in to the government positions.

Spinnakr: Spinnakr says, Website targeting triples your conversions, but you’re probably not using it because it’s too complicated. Spinnakr makes it possible.

Swithchcam: Switchcam recreates the concert experience by combining and syncing fan-recorded videos.

Talkdesk: Talkdesk  lets your company have a contact center in the browser. It provides information about the caller by integrating with services such as Salesforce and Zendesk.

Tiny Review: Tiny Review is Instagram for Yelp reviews. The fastest and funnest way to say what you think about a place.

WeddingLovely: WeddingLovely is building tools and directories to promote amazing small and independent wedding vendors.

In honor of the Halloween reveal, 500 Startups put together this video tribute Michael Jackson’s Thriller. Watch it, if you dare.

[Image: Thomas Hawk/Flickr]