ETE is developed as an academic free software tool. If you find ETE useful for your work, please cite:
Jaime Huerta-Cepas, Joaquín Dopazo and Toni Gabaldón. ETE: a python Environment for Tree Exploration. BMC Bioinformatics 2010, 11:24. doi:10.1186/1471-2105-11-24
The ETE Toolkit was originally developed at the bioinformatics department of CIPF and greatly improved at the comparative genomics unit of CRG. At present, ETE is maintained by Jaime Huerta-Cepas at the Structural and Computational Biology unit of EMBL (Heidelberg, Germany).