There are several natural language processing tools available for sentiment analysis and language translation. Some popular open-source options include:

For Sentiment Analysis:

NLTK (Natural Language Toolkit)

TextBlob

VADER (Valence Aware Dictionary and sEntiment Reasoner)

Stanford CoreNLP

For Language Translation:

Google Translate API

Microsoft Translator Text API

IBM Watson Language Translator

Amazon Translate

It's worth noting that many of these tools have various features, such as sentiment analysis and language translation, built into them. Additionally, you may also want to consider cloud-based services like Google Cloud NLP, Amazon Comprehend, and Azure Cognitive Services.