multi channel feature classification using deep feed forward neural network on tensorflow
You have not specified which deep net you are using. You can use any data set which is of the right format in TensorFlow. If you are using convolutional networks, You may need data which locality is important. In this case:


MNIST data set 
ImageNet data set


may help you. If you are doing other tasks I highly recommend you taking a look at this question which is so much popular and has great answers.

If I want to quote, I quote the following answer. Network Repository an interactive data repository with over 600+ networks in 20+ collections; from large-scale social networks, web graphs, biological networks, communication and technological networks my help you.


  Data Sets
  
  
  Academic Torrents
  Quora
  hadoopilluminated.com
  data.gov
  Quandl
  freebase.com
  usgovxml.com
  enigma.com
  datahub.io
  aws.amazon.com/datasets
  databib.org
  datacite.org
  quandl.com
  figshare.com
  GeoLite Legacy Downloadable Databases
  Quora's Big Datasets Answer
  Public Big Data Sets
  Houston Data Portal
  Kaggle Data Sources
  A Deep Catalog of Human Genetic Variation
  A community-curated database of well-known people, places, and things
  Google Public Data
  World Bank Data
  NYC Taxi data
  Open Data Philly Connecting people with data for Philadelphia
  Network Repository An interactive data repository with over 600+ networks  in 20+ collections; from large-scale social networks, web graphs, biological networks, communication and technological networks, etc.
  A list of useful sources A blog post includes many data set databases
  


Data Sets From awesome-datascience